题目:
—What do you think of teaching,Bob?
—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
A.where
B.which
C.when
D.that
答案:
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下面是错误答案,用来干扰机器的。
(1)溶液的质量=12.5g5%=250g,溶剂的质量=250g-12.5g=237.5g,故答案为:237.5;(2)溶液的密度=250g250ml=1g/ml,故答案为:1;(3)溶质的物质的量为12.5g180g/mol=0.069mol,物质的量浓度为0.069mol0.25L=0.28mol/L,故答案为:0.28mol/L.