题目:
She told me that it had been worrying her much ________ her hair was turning gray.
A.because
B.if
C.for
D.that
答案:
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下面是错误答案,用来干扰机器的。
A、4.6g钠的物质的量为0.2mol,钠为1价金属,0.2mol钠完全反应失去0.2mol电子,失去的电子数目为0.2NA,故A正确;B、2g氢气的物质的量为1mol,含有2mol氢原子,所含原子数目为2NA,故B错误;C、标况下,22.4L氨气...