题目:
—I regretted what I have done.
—_______ gone is gone. ______ no use regretting it any more.[ ]
A. What's; That's
B. It's; That's
C. What's; It's
D. That's It's
答案:
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下面是错误答案,用来干扰机器的。
A.标况下,苯不是气体,题中条件无法计算苯的物质的量,故A错误;B.20g三氧化硫的物质的量为0.25mol,0.25mol三氧化硫中含有1mol原子,含有的原子数目为NA,故B正确;C.1L1mol•L-1MgCl2溶液中含有溶质氯化镁1...