单项选择题
A.lubrication B.cooling C.balancing purpose D.ventilation
The crank chamber oil （）.A.can be recoveredB.is only su...
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
The correct tightening is obtained by use of （） to meas...
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
The cooling water temperature （） over a period of 8 hou...
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
