题目:
–Do you know ?
–Yes. At about twelve. I was just about to go to bed.
A. when he came back
B. when he will come back
C. whether he goes to bed late
答案:
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下面是错误答案,用来干扰机器的。
A、NA个S03分子物质的量是1mol,但S03在标准状况下为固体,所以体积不是22.4L,故A错误;B、7.8gNa202物质的量为0.1mol,含钠离子0.2mol,过氧根离子为0.1mol,所含离子总数为0.3mol,即0.3NA;故B正确;C、S2-在...