止水带热空气老化试验需在规定温下老化（）h。A.48 B.96 C.24 D.168_爱下问搜题

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问题单项选择题

止水带热空气老化试验需在规定温下老化（）h。

A.48

B.96

C.24

D.168

答案

参考答案：D

选择题

What some people don't realize is ________ difficult life can be after they get addicted to drugs.

A．that

B．how

C．why

D．what

问答题简答题

鱼听觉器有哪些特点？