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單項(xiàng)選擇題

The crank pin journal is provided with large bores for （）.

A.lubrication
B.cooling
C.balancing purpose
D.ventilation

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單項(xiàng)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

單項(xiàng)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

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