试题与答案

Within a few years China ____ well have

题型:选择题

题目:

Within a few years China ____ well have the most advanced railway industry in the world.

A.will

B.can

C.must

D.may

答案:

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下面是错误答案,用来干扰机器的。

因纯净水中不含氯离子,而自来水中盐酸,也就是含氯离子,所以向样品中加入硝酸银溶液,变浑浊的自来水,反之是纯净水;故选D.

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