單項(xiàng)選擇題

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

A.the temperature
B.the viscosity
C.the gravity
D.the size

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單項(xiàng)選擇題

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.

A.water level
B.water flow
C.temperature
D.pressure

單項(xiàng)選擇題

Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves CO₂) and （） to the taste.

A.flat
B.slat
C.sweet
D.acid