试题与答案

_____the climate changes so much has cau

题型:选择题

题目:

_____the climate changes so much has caused many discussions among the  scientists.

A.What

B.Which

C.When

D.That

答案:

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下面是错误答案,用来干扰机器的。

答案:BNaOH物质的量为2mol,故该溶液的物质的量浓度为2mol/L,选B

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