Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82

Deprecated: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior in /www/wwwroot/4-17ll.com/label.php on line 82
男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美
随机图片

男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美

更新时间: 浏览次数: 247

 
男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美123456已更新(123456已更新)



Random Image



男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美在线观看电话:(1)123456(点击咨询)(2)123456(点击咨询)









男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美24小时热线(1)123456(点击咨询)(2)123456(点击咨询)





男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美24小时在线观看电话《今日发布》

男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美附近上门电话









7天24小时人工电话为您、男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美团队在调度中心的统筹调配下,线下专业及各地区人员团队等专属,整个报修流程规范有序,后期同步跟踪查询公开透明




男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美在线观看查询









男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美24小时在线观看电话:

 黔西南布依族苗族自治州(晴隆县、兴仁市、册亨县、安龙县、望谟县、普安县、贞丰县、兴义市)





仙桃市(潜江市、神农架林区、天门市)









张掖市(民乐县、甘州区、肃南裕固族自治县、山丹县、高台县、临泽县)









西宁市(城西区、大通回族土族自治县、城北区、城中区、城东区、湟源县、湟中区)  龙岩市(新罗区、长汀县、永定区、武平县、连城县、上杭县、漳平市)









益阳市(赫山区、南县、安化县、资阳区、沅江市、桃江县)









贵阳市(乌当区、清镇市、开阳县、花溪区、南明区、息烽县、修文县、云岩区、观山湖区、白云区)









阿克苏地区(柯坪县、温宿县、乌什县、库车市、新和县、阿克苏市、阿瓦提县、沙雅县、拜城县)伊春市(丰林县、铁力市、友好区、汤旺县、嘉荫县、南岔县、乌翠区、伊美区、大箐山县、金林区)









广西壮族自治区  绵阳市(三台县、安州区、游仙区、北川羌族自治县、平武县、梓潼县、盐亭县、江油市、涪城区)









汉中市(汉台区、勉县、留坝县、镇巴县、城固县、佛坪县、宁强县、洋县、略阳县、南郑区、西乡县)









新乡市(牧野区、新乡县、获嘉县、卫辉市、原阳县、辉县市、延津县、红旗区、凤泉区、封丘县、卫滨区、长垣市)









泰州市(兴化市、靖江市、海陵区、泰兴市、高港区、姜堰区)荆门市(东宝区、钟祥市、掇刀区、沙洋县、京山市)









阿坝藏族羌族自治州(阿坝县、小金县、马尔康市、壤塘县、红原县、若尔盖县、九寨沟县、金川县、松潘县、汶川县、理县、茂县、黑水县)









内江市(隆昌市、资中县、市中区、东兴区、威远县)









大同市(云州区、新荣区、天镇县、左云县、云冈区、灵丘县、阳高县、平城区、浑源县、广灵县)









濮阳市(濮阳县、南乐县、华龙区、台前县、清丰县、范县)









昌吉回族自治州(吉木萨尔县、木垒哈萨克自治县、阜康市、奇台县、呼图壁县、玛纳斯县、昌吉市)









文山壮族苗族自治州(广南县、西畴县、砚山县、文山市、麻栗坡县、丘北县、富宁县、马关县)

  来源:国际金融报

  4月20日,琏升科技(300051.SZ)披露重组预案,公司拟通过定增募资方式收购兴储世纪69.71%股份,加码光储一体化业务。此番押注能否扭转其连亏局面,成为市场焦点。

  4月21日,琏升科技股票复牌后尾盘涨停。截至当日收盘,该公司每股报7.46元,涨幅19.94%,总市值27.75亿元。

  剑指“光储一体化”

  具体来看,琏升科技拟通过发行股份及支付现金的方式,向自贡金马产投、福州数字新基建产业投资合伙企业(有限合伙)、青创伯乐大海(青岛)股权投资合伙企业(有限合伙)等38名交易对方购买其合计持有的兴储世纪69.71%股份。

  兴储世纪原名为中兴能源有限公司,曾是“中兴系”旗下第一家负责储能业务的公司。目前,兴储世纪无控股股东、实际控制人,第一大股东为自贡金马产投。

  兴储世纪股权结构

  琏升科技此前表示,亦有意购买标的公司其他股东持有的股份。不过,“中兴系”创始人侯为贵、“中兴系”公司中兴维先通、中兴和润所持有的30.29%股份并未参与上述交易。

  兴储世纪与琏升科技属于同行业上下游,其主营业务为光伏发电及光伏相关智能微电网产品研发、生产与销售,公司光伏发电项目开发覆盖国内新疆、甘肃、四川等地,以及巴基斯坦、欧洲、非洲、东南亚等地区。

  2023年与2024年,兴储世纪分别实现营业收入10.37亿元、9.8亿元;净利润7589.29万元、1.92亿元。

  兴储世纪曾计划通过IPO上市,目前仍处于上市辅导阶段。4月15日披露的上市辅导工作进展报告中提及,公司除光伏电站外的其他业务尚处于发展阶段,收入毛利占比未呈现明显增加,辅导小组督促公司结合目前的经营情况及发展规划加强市场开拓及产品推广,在新兴市场争取更多市场份额。

  琏升科技则对本次收购寄予厚望。该公司表示,控股兴储世纪后,可充分发挥其与上市公司的业务协同性,实现在产品、市场、产能等资源的有效整合。本次交易将有利于上市公司推进做深光伏高效异质结技术产业链布局,把握光储一体化的市场机遇,拓展海外市场。通过产业整合加强上市公司整体体量和质量,提升上市公司的核心竞争力和抵御经营风险的能力。

  但截至公告日,本次交易标的资产审计及评估工作尚未完成,预估值及交易价格尚未确定。

  值得注意的是,琏升科技控股子公司天津琏升不再纳入本次收购范围。

  早在4月8日,琏升科技曾计划同步收购天津琏升少数股权。最新重组预案则显示,鉴于“本次收购天津琏升少数股权的条件尚不成熟”,琏升科技选择放弃。

  即将走向“七连亏”

  这或许是琏升科技的又一次“自救”。

  琏升科技原身为三五互联,始创于2004年,2010年作为福建第一家创业板公司成功上市。早年间,公司主要从事提供软件产品和服务。但自2018年以来,琏升科技陷入持续亏损。

  2022年,琏升科技启动转型“自救”之路,跨界至异质结电池(HJT)赛道。同年年底,琏升科技完成易主,海南琏升成为公司控股股东,黄明良、欧阳萍夫妇成为公司实际控制人。

  在聚焦“追光”主业的同时,琏升科技还不断通过剥离旧业务进行“瘦身”。2023年以来,琏升科技多次出售天津三五互联移动通讯有限公司等公司股权。2024年12月,该公司还进一步出售了厦门三五互联信息有限公司100%股权及部分商标。

  在HJT业务方面,琏升科技目前已投建两大异质结电池项目生产基地,分别位于四川省眉山市丹棱县(设计产能8GW)、江苏省南通市高新区(设计产能12GW)。截至去年6月末,公司已投建眉山丹棱基地标准产能3.8GW。江苏南通基地12GW高效异质结电池片一期3GW项目正在建设中。

  然而,大刀阔斧的转型并未扭转其业绩颓势。2018年至2023年,琏升科技持续亏损,归母净利润亏损金额已达7.69亿元。

  尤其是2023年年末以来,光伏行业整体遇冷,且HJT技术受制于前期投资成本较高,当前市场份额相对较低。2024年,琏升科技预计归母净利润继续亏损0.6亿元至1.2亿元,走向七连亏。

  与此同时,公司背负较大财务压力。截至2024年三季度末,琏升科技资产负债率已达73.21%,较2022年年末上涨4.02个百分点;公司货币资金仅剩0.95亿元。

  来源:同花顺

  记者注意到,本次向控股股东募资也暗含为上市公司“输血”的打算。公告显示,本次募集配套资金拟用于支付本次交易的现金对价、中介机构费用和交易税费、标的公司项目建设及补充流动资金等,其中用于补充公司流动资金、偿还债务的比例不超过本次交易作价的25%或募集配套资金总额的50%。

  在发布募资重组消息的同一天,琏升科技终止了2023年度向特定对象发行A股股票事项。终止原因中提到,这一决定结合了公司业务发展规划及资本运作计划等因素。

  4月21日,据中国农业发展银行消息,该行在中央结算公司通过公开招标方式,顺利发行首只支持国家储备林建设主题绿色债券40亿元,发行期限为3年,发行利率为1.4761%,认购倍率为2.87倍。本次发行延续“孪生绿债”模式,能够更好揭示绿色债券的绿色价值,积极引导社会资金流向绿色发展领域,得到工商银行、农业银行、江苏银行、渤海银行等机构的大力支持。

  据了解,本期债券严格遵循人民银行等监管部门“可测度、可核查、可验证”原则,募集资金将全部用于农发行支持国家储备林建设项目的贷款投放。对应的国家储备林项目经第三方机构认证,符合《绿色债券支持项目目录(2021年版)》标准,均属于生态环境产业领域,将有效发挥固碳释氧、气候调节、生态修复、环境质量优化和生物多样性保护作用。

  农发行表示,下一步,将继续提升绿色金融服务水平,组合运用多种服务手段,加大对重点领域、重点区域的支持力度,以绿色金融高质量发展为美丽中国建设筑牢支撑。

  4月21日金融一线消息,江阴银行发布公告称,董事会于近日收到公司董事会秘书卞丹娟的书面辞职报告,卞丹娟因年龄原因,申请辞去该行董事会秘书职务,辞职后,卞丹娟将继续在该行担任董事职务。

  董事会同意聘任周晓堂为该行董事会秘书,任期自本次董事会审议通过之日起至第八届董事会届满之日止,并在报国家金融监督管理总局无锡监管分局核准任职资格后履职。

  简历显示,周晓堂,男,1990年出生,中共党员,本科学历。2012年参加工作,曾在信永中和会计师事务所工作,2016年5月加入江阴银行,历任证券事务代表、董事会办公室主任助理、综合办公室副主任、北国支行行长、营业部主任,现任江阴银行党委办公室主任、董事会办公室主任。

  亚洲交易时段,因交易员不愿推低欧元/瑞郎,瑞郎对美元与欧元对美元走势亦步亦趋,给美元造成额外压力。这构成了日元、瑞郎和欧元同时走强的美元完全看跌光景。

  事实上,欧元/美元周一触及了2021年11月以来的最高水平。

  瑞士央行更关注欧元/瑞郎而不是美元/瑞郎,这其实就意味着,美元/瑞郎在铸成坚实底部之前可能还有得跌。

  鉴于欧洲大部分地区都要到周二才结束放假,因此不会有多少外汇交易员愿意去碰瑞郎的钉子。

男女打扑克 - 精品国色天香新区卡一卡二,畅享奢华与宁静的完美的相关文章 openai官宣400亿美元最新融资的相关文章
白鹿讲述职场里肯定有多重要
人民日报评商家招牌禁用红蓝
张若昀主演的《风起大漠》删至75集
公安机关悬赏通缉3名美国特工
甲亢哥保镖小美再回忆中国行
男子在山姆采购550万元商品遭冒领
  • 友情链接:
  • 辛巴实控两家公司成被执行人 中国政法大学通报焦某某涉嫌抄袭 恒生中国委任李家超长子为副董事长 不少年轻人流行用iPhone6拍照 水果姐乘飞船上太空 手持花瓣自拍 撞死一家三口司机只认交通肇事罪 为什么虞书欣是天选代言人 近30家公司宣布股票增持 双成药业可能被实施退市风险警示 为什么虞书欣是天选代言人