單項選擇題The crank pin journal is provided with large bores for ().

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


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1.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

2.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

3.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