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458、Operate the unit for two cycles to remove air from the lines.

A
 Operate the unit twice to remove air from the lines.
B
 Cycle the unit twice to remove lair from the lines.
C
 The unit is cycled repeatedly to remove air from the lines.

答案解析

正确答案:B

解析:

解析:注释:two 表示二; twice 表示两次。cycle“循环”既可作动词也可做名词。

相关知识点:

操作部件两循环排空气

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