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1.上游：聚焦关键矿产资源，洛阳钼业和力勤资源是其中的代表性项目。自2021年起陆续布局，除持有上市公司股权外，公司还参与矿产资源的收购与参股，例如持有非洲Manono锂矿（刚果（金））24%股权，该矿锂资源量约4亿吨LCE；同时参与南美盐湖项目（智利、阿根廷）等。，推荐阅读币安_币安注册_币安下载获取更多信息
I think if += would always have to make a copy, I would have opted to not support it for lists at all and just say .extend(), which does work in that tuple case.，详情可参考服务器推荐
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