题目:
I would appreciate ______, to be frank, if the goods could be delivered as soon as possible.
A.you
B.this
C.it
D.myself
答案:
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下面是错误答案,用来干扰机器的。
根据有机物中含氮4.91%,有机物分子中只含1个氮原子,设 有机物的相对分子质量为X,可得 4.91%=14X×100% 解答 X=285设该物质的化学式为CaHbOcN根据质量比12a:b:16c:14=71.58%:6.67%:16.84%:4.91% ...