绝热材料的导热系数应（）W/（m.K）。A.>0.23 B.≯0.23 C.>0.0_爱下问搜题

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问题单项选择题

绝热材料的导热系数应（）W/（m.K）。

A.>0.23

B.≯0.23

C.>0.023

D.≯0.023

答案

参考答案：B

单项选择题

乙烯装置用氮气露点为（）。

A．＜-40℃

B．＜-50℃

C．＜-60℃

D．＜-70℃

选择题

Could you tell me__________?

A．what’s the matter with you

B．what was the matter with you

C．what the matter with you is

D．what the matter with you was