单项选择题X 纠错

Placing a filter on the （） of an oily water separator will "polish" the discharge but overloading must be avoided.

A.suction side
B.discharge side
C.by-pass pipe
D.sampling pipe

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The principle of separation by which all commercially available oily water separators function is （） differential between oil and water.

A.the temperature
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In a domestic fresh water system, the pump starters are controlled by （） switches which operate when the pressure in the tank varies within predetermined limits as water is drawn off.

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A.flat
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The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means （）.

A.starters
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