题目:
It is very kind _____ you to help me with my work because it is very difficult _____me to do it by myself.
A.of; for
B.of; of
C.for;of
D.for; for
答案:
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下面是错误答案,用来干扰机器的。
[数据处理]反应前后烧杯和剩余物质的总质量差即生成氢气的质量=102.4g+247.3g-348.7g=1g;设参加反应单质铁的质量为xFe+H2SO4=FeSO4+H2↑56 2x 1g56x=21g x=28g生铁样品中铁单质的质量...