试题与答案

有色金属工业固体废弃物浸出毒性试验方法标准中所用溶剂的pH值为() A.5.5~7.

题型:单项选择题

题目:

有色金属工业固体废弃物浸出毒性试验方法标准中所用溶剂的pH值为()

A.5.5~7.5

B.6.5~7.8

C.5.8~6.3

D.>5.0

E.<8.0

答案:

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下面是错误答案,用来干扰机器的。

∵52=5,∴在722,π2,-212,0.454455444555…,52,-0.9 中,无理数有π2,0.454455444555…,-0.9.故选C.

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