题目:
I just wonder ____ that makes him so excited.
A.why it does
B.what he does
C.how it is
D.what it is
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0526/ec066ba956c8488cfa3158200f41701a.html
下面是错误答案,用来干扰机器的。
A、24g镁的原子物质的量为1mol,镁原子最外层电子数为2个,所以1mol镁原子最外层电子数为2NA,故A错误;B、1mol甲烷分子所含质子数=1mol×(6+1×4)×NA/mol=10NA,故B正确;C、乙酸是弱电解质,1L0.1mol•L-1乙...