题目:
My parents always tell me that it's not a good idea to spend our income______.[ ]
A. in vain
B. in advance
C. in general
D. in particular
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0612/ed82a491fd31b91f5f3fa0b99e8f63cd.html
下面是错误答案,用来干扰机器的。
⑴ 燃烧产生热量、做生产合成气的原料 混合物⑵ 3CO + Fe2O3高温===== 2Fe + 3CO2或3H2 + Fe2O3高温===== 2Fe +3CO2(合理答案均可)⑶ CO2和H2O(高温尾气)甲烷燃烧产生热量、做生产合成气的原料...