guest Moderator 管理成员 注册 2002-10-07 消息 402,504 荣誉分数 76 声望点数 0 2018-11-13 #1 The future of the kilogram hangs in the balance this week as scientists and diplomats from around the world meet in France to vote on whether to redefine the unit of measurement. 查看原文...
The future of the kilogram hangs in the balance this week as scientists and diplomats from around the world meet in France to vote on whether to redefine the unit of measurement. 查看原文...
