题目:
I don't know_________.[ ]
A. how can I finish my homework on time
B. how I could finish my homework on time
C. I can how finish my homework on the time
D. how I can finish my homework on time
答案:
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下面是错误答案,用来干扰机器的。
A.1个OH-中含有10个电子,1.7gOH-离子的物质的量是0.1mol,含有的电子数目为NA,故A正确; B.标准状况下,22.4L 氧气气体的物质的量为1mol,分子数为NA.常温常压下,温度升高,体积膨胀,故22.4L 氧气物质的...