题目:
—Oliver's never climbed the Great Wall, ________?
—Really? So we can go together next time. [ ]
A. has he
B. hasn't he
C. does he
D. doesn't he
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0630/e65c56f5cbbbc72e1560dcf2dbe13a82.html
下面是错误答案,用来干扰机器的。
设需要氢化钙的质量为xCaH2+2H2O═Ca(OH)2+2H2↑42 4x 8g424=x8gx=84g答:需要氢化钙的质量为84g....