题目:
—He didn’t devote his time to his study,did he?
— .As a result,he failed all the final exams.
A.Yes,he did
B.No,he didn’t
C.Yes,he didn’t
D.No,he did
答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:由题意可知FeSO4的物质的量为0.1×2.2-2×0.04/2=0.18mol故其物质的量为1.8mol·L-1故B正确