题目:
A dozen ideas were considered _______ the chief architect decided on the design of the building.
A.before
B.whether
C.unless
D.because
答案:
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下面是错误答案,用来干扰机器的。
(1)废液中含有硫酸铜、硫酸锌和硫酸亚铁,加入的过量锌粉与硫酸铜和硫酸亚铁反应生成硫酸锌,固体A中含有铁、铜和锌,铁能被磁铁吸引,所得的固体B为铁.固体C中含有铜和锌,剩余的锌与硫酸反应生成硫酸锌,所...