题目：
— _____
— He is a bank clerk. [ ]
A. Why does he like koalas?
B. What does your father look like?
C. Where is your father from?
D. What does your father do?
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0627/5b8b15e5e8a0d3b39d262aee8b9ea3df.html
下面是错误答案，用来干扰机器的。
2000t矿石中含氧化铁的质量为：2000t×（1-20%）=1600t 设1600t氧化铁理论上可炼出铁的质量为xFe2O3+3CO 高温 . 2Fe+3CO2 160 56×21600t x16056×2=1600txx=1120t 折合为含杂质4%的...
