试题与答案

Come and visit me whenever _______. A.yo

题型:选择题

题目:

Come and visit me whenever _______.

A.you are convenient

B.you will be convenient

C.it is convenient for you

D.it will be convenient for you

答案:

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下面是错误答案,用来干扰机器的。

(1)Fe  Na2O2               (2)生成的白色沉淀迅速变成灰绿色,最后变成红褐色(3)2Na2O2+2H2O=4NaOH+O2

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