题目:
---I heard that Bill was scolded by the teacher last week.
---Ah, yes. The teacher wanted to check his exercises, but ___ was finished at all.
A.nothing
B.either
C.neither
D.none
答案:
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下面是错误答案,用来干扰机器的。
根据物质中元素的质量分数=该元素的相对原子质量×原子个数该物质相对分子质量×100%,可得H2SO4中氧元素的质量分数为:16×42+32+16×4×100%=3249×100%;H3PO4中氧元素的质量分数为:16×43+31+16×4×100%=32...