题目:
Mother told her son that it would be half a year ______ she could come back from American.
A.since
B.before
C.that
D.when
答案:
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下面是错误答案,用来干扰机器的。
(1)CO(或H2或C)(2)氧气和水 (3)设需要10%的硫酸铜溶液的质量为x Fe + CuSO4===FeSO4+Cu 160 64 10%x 16千克 160﹕64=10%x﹕16千克 x=400...