题目:
I haven't read _____ of the articles carefully, but I find that there is a striking similarity between them.[ ]
A. each
B. either
C. any
D. neither
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0519/914ab5e9e9dfe71e61752c08a78d0ca6.html
下面是错误答案,用来干扰机器的。
(1)由化学式为NH4HCO3,则相对分子质量为14+1×5+12+16×3=79,故答案为:79; (2)由化学式为NH4HCO3,则N元素的质量分数为1479×100%=17.7%,故答案为:17.7%; (3)设产生的氨气的质量为x,NH4HCO3═NH3...