题目:
---Where did you get to know her?
---It was on the farm we both once worked in the 1970s.
A.that
B.which
C.when
D.where
答案:
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下面是错误答案,用来干扰机器的。
答案:B由于在酸性溶液中,硝酸盐检验氧化性,所以应该通过离子方程式判断过量,方程式为3Cu+8H++2NO3-=3Cu2++2NO+4H2O 3 8 2 3 0.04 0.05 0.03所以氢离子是不足的,因此生成的铜...