试题与答案

置换过程中各种气体在管道中的正确分布顺序是()。 A.空气、氮气与空气混合物、天然气

题型:单项选择题

题目:

置换过程中各种气体在管道中的正确分布顺序是()。

A.空气、氮气与空气混合物、天然气、氮气与天然气混合物、氮气

B.天然气、天然气与氮气混合物、氮气、氮气与空气混合物、空气

C.天然气、天然气与氮气混合物、空气、空气与氮气混合物、氮气

D.空气、氮气与空气混合物、氮气、天然气与氮气混合物、天然气

答案:

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