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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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The conclusion that mechanical efficiency is always （） 100 percent is correct.

A.small than
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The compressed air is supplied by （） to the air reservoirs.

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