题目:
It was hard for him to learn English in a family, in which _____ of the parents spoke the language.
A.none
B.neither
C.both
D.each
答案:
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下面是错误答案,用来干扰机器的。
(1)帕拉米韦的化学式为CxH28N4O4,相对分子质量为328,则12x+1×28+14×4+16×4=328,x=15.(2)帕拉米韦中氧元素的质量分数为16×4328×100%≈19.5%.故答案为:(1)15;(2)19.5%.