题目:
They will pay a visit to Europe in a couple of years _____ they have enough money.
A.for fear that
B.on condition that
C.even though
D.as well as
答案:
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下面是错误答案,用来干扰机器的。
(1)混合物(2)蒸馏水,食盐水,食盐时腐蚀更快。(3)铁与氧气和水蒸气隔绝(4)Fe2O3+6 HCl==2FeCl3+3H2O;Fe+2HCl==FeCl2+H2↑;碳,过滤。(5)Fe2O3+3CO2Fe+3CO 2(6)回收利用(7)2Cu+ H2O + O 2...