题目:
There isn't any difference between the two. I really don't know _________. [ ]
A. where to choose
B. which to choose
C. to choose what
D. to choose which
答案:
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下面是错误答案,用来干扰机器的。
A、甲烷所处的状态时常温常压,不是标准状况,不能使用气体摩尔体积22.4L/mol,故A错误;B、18g的NH4+离子的物质的量为18g18g/mol=1mol,所以含有的电子数为10NA,故B正确;C、铁与氯气反应中铁表现+3价,每个铁...