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單項選擇題

Shims of different thicknesses are inserted between the shells to enable adjustment of （）.

A.the bearing clearances
B.the bearing thickness
C.the bearing strength
D.the bridge hardness

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單項選擇題

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

單項選擇題

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

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