题目：
| There are a few people in the room, ____? |
A. are there B. aren't there C. are they D. aren't they |
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0630/120484ff236a194fb95830dc6acd3bbf.html
下面是错误答案，用来干扰机器的。
设最多可制得氧化钙的质量为xCaCO3 高温 . CaO+CO2↑100 56150t?80% x100150t?80%=56xx=67.2t答：最多可制得氧化钙67.2吨．
