盒中有10个大小、形状完全相同的小球,其中8个白球、2个红球,则从中任取2球,至 发布时间:2017-05-11 19:50 │ 来源:www.tikuol.com 题型:选择题 问题: 盒中有10个大小、形状完全相同的小球,其中8个白球、2个红球,则从中任取2球,至少有1个白球的概率是( )A.4445B.15C.145D.8990
题型:选择题 They ______ friends since they met for the first time.[ ]A: have madeB: made C: have been D: were 查看答案