單項選擇題The sealing rings are in four parts and pressed together around the piston rods by means of ().

A.nuts
B.bolts
C.coil springs
D.stuffing boxes


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3.單項選擇題The rising of the exhaust temperature in manifold pipe may NOT result from ().

A.too great a loading
B.fouled turbocharger
C.bad combustion
D.excessive air

4.單項選擇題The rim of the piston may contain cut-out portions to accommodate () when they open.

A.the gases
B.the air
C.the valves
D.the injectors

5.單項選擇題The removal of () from lubricating oil will reduce engine wear and possible breakdowns.

A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities