题目内容

活套扫描器是一种用于检测()大小的检测器。

A. 速度量
B. 压下量
C. 宽展量
D. 活套量

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An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().

A. restriction in refrigerant piping
B. air and non-condensable gases in the condenser
C. water in the refrigerant
D. flooding back of liquid refrigerant from the evaporator

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