下列分子中所有原子都满足最外层8电子结构的是 [ ] A.BF3 B.H2O C 发布时间:2017-07-27 01:04 │ 来源:www.tikuol.com 题型:选择题 问题: 下列分子中所有原子都满足最外层8电子结构的是 [ ]A.BF3 B.H2O C.SiCl4 D.PCl5
题型:选择题 --- It’s difficult for the village children to cross the river to get to school.--- I think a bridge ________ over the river.A.should be builtB.should buildC.was builtD.has been built 查看答案