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單項選擇題

The crank chamber oil （）.

A.can be recovered
B.is only supplied to cylinders
C.only feeds the main bearing
D.is a kind of detergent

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單項選擇題

The correct tightening is obtained by use of （） to measure the extension given to the bolts.

A.pressure gauges
B.stretch gauges
C.thermometers
D.bridge gauges

單項選擇題

The cooling water temperature （） over a period of 8 hours, and then shut down.

A.should be gradually increased
B.should be gradually reduced
C.should be constantly kept
D.should be varied up and down

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