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單項選擇題

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

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單項選擇題

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

單項選擇題

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
B.pressure switches
C.pressure
D.water

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