题目:
I heard that you really had a wonderful time at John's birthday party, _____?
A.didn't I
B.didn't you
C.hadn't you
D.will you
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A、H2O的体积是1L,NaCl溶液的体积不是1L,错误;B、从1 L 2 mol/L的H2SO4溶液中取出0.5 L,该溶液的浓度仍然为2 mol•L‾1,错误;C、配制500 mL 0.5 mol/L的CuSO4溶液,需胆矾的质量...