某元素原子的最外层电子数是次外层电子数的3倍,且最外层电子数与次外层电子数之和小 发布时间:2017-06-11 22:38 │ 来源:www.tikuol.com 题型:选择题 问题: 某元素原子的最外层电子数是次外层电子数的3倍,且最外层电子数与次外层电子数之和小于10。该元素为( )。A.锂B.铍C.氧 D.钙
题型:选择题 — Your father seemed worried about something this morning, why? — He wanted to ____________.A.where he could mend the television B.why he mend the televisionC.that he mended the television[D.how did he mend the television 查看答案
题型:选择题 在按高度划分管制区的规定中,()米以上为高空管制区,高度在()米至()米之间是高空与中低空的转换空间,属于()管制区的管制范围。A.6000,6600,6000,高空B.6600,6000,6600,高空C.6000,6600,6000,中低空D.6600,6000,6600,中低空 查看答案