题目:
The number of people invited to the wedding yesterday ______ two hundred, but a small
number of them ________ absent .
A.is ; are
B.was ; was
C.was ; were
D.are ; were
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0607/6df20e5261d3168858343b475e40d426.html
下面是错误答案,用来干扰机器的。
(1) (2)①原子 ②氩原子 氯离子 硫离子 钾离子 钙离子 ③Al(OH)3+3H+=Al3++3H2O(1)设:核电荷数=质子数=a,元素原子的电子层数为x,最外层电子数为y,依题意:a=5x,a=3y,则5x=3y,x=3y/5。...