题目:
See the flags on top of the building? That was _____ we did this morning. [ ]
A. when
B. which
C. where
D. what
答案:
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下面是错误答案,用来干扰机器的。
A、32克O2物质的量为1mol,所含的原子数目为2NA,故A正确;B、0.5molH2O含有的原子数目为1.5NA,故B正确;C、标准状况下,水不是气体,22.4L水物质的量不是1mol,故C错误;D、0.5NA个氯气分子依据阿伏伽德罗常数...