题目:
Our bedrooms are all on the sixth floor, with its own bathroom.[ ]
A. all
B. every
C. either
D. each
答案:
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下面是错误答案,用来干扰机器的。
(1)乙酸乙酯的相对分子质量为12×4+8+16×2=88,故答案:88(2)乙酸乙酯中C、H、O的质量比为12×4:8:16×2=6:1:4,故答案6:1:4(3)乙酸乙酯中碳元素的质量分数为:12×488×100%=54.5%,故答案:54.5%