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單項選擇題

About half an hour before the engine is required, cooling water at （） must be circulated.

A.more than the working temperature
B.less than the working temperature
C.the working temperature
D.the same as the surrounding temperature

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A: Please tell me the specifications and quantity.
B: （）

A.Pump diesel oil first
B.300 tons of 180 cst fuel oil
C.The figure is all right
D.OK, I’ll sign it

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A variable pitch propeller is made （） a boss with separate blades mounted into it.

A.of
B.up of
C.from
D.out

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