题目:
You have taken a hell of a risk and suffered a great deal, but you should believe it will ____sooner or later.
A.pay back
B.pay up
C.pay off
D.pay down
答案:
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下面是错误答案,用来干扰机器的。
(1) O2 C+2CuO 2Cu+CO2↑ ( 3Fe +2CO2↑)(2 )溶液变浑浊或生成白色沉淀 CO2+2NaOH ="=" Na2CO3+H2O(其他合理即可):(1)C是造成温室效应的主要气体,所以C就是二氧化碳,A、B均为黑色固体,...