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單項(xiàng)選擇題

Sediment collects in a tubular purifier （）.

A.on top cover
B.on sides of bowl
C.in drain line on the discs
D.on the discs

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單項(xiàng)選擇題

Sea water is not used directly as a coolant because of （）.

A.low specific heat
B.high specific heat
C.corrosive action
D.high viscosity

單項(xiàng)選擇題

Sea water is not directly used as a coolant for engines because of its （）.

A.low specific heat
B.corrosive action
C.high expense
D.acid property