在数组声明语句Dima(3,-2to2,5)AsLong中,数组a包含元素的个数为( 发布时间:2019-01-20 17:17 │ 来源:www.tikuol.com 题型:单项选择题 问题: 在数组声明语句Dima(3,-2to2,5)AsLong中,数组a包含元素的个数为()。A.13B.60C.75D.120
题型:单项选择题 在一定条件下,RO3n-和氟气可发生如下反应:RO3n-+F2+2OH-==RO4-+2F-+H2O,从而可知在RO3n-中,元素R的化合价是[ ]A、+4 B、+5 C、+6 D、+7 查看答案
题型:单项选择题 -I called you yesterday evening, but there was no answer.-Oh, I am sorry. I _________ dinner at my friend's home.[ ]A. have hadB. hadC. was havingD. had had 查看答案