單項(xiàng)選擇題The connecting rod large end bearing shell generally has tags for location and oil grooves round the center of its axial length which correspond with grooves in the （） through which oil is transmitted up the rod to lubricate the small end.

A.connecting rod
B.piston rod
C.bearing housing
D.none of the above


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1.單項(xiàng)選擇題The conclusion that mechanical efficiency is always （） 100 percent is correct.

A.small than
B.more than
C.little than
D.less than

2.單項(xiàng)選擇題The compressed air is supplied by （） to the air reservoirs.

A.compressors
B.forced fans
C.ventilators
D.generators

5.單項(xiàng)選擇題The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.

A.mechanical lubricator
B.lubrication function
C.forced feed system
D.bearing lubrication