单项选择题
The crank pin journal is provided with large bores for （）.
A.lubrication
B.cooling
C.balancing purpose
D.ventilation
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
