單項(xiàng)選擇題The scavenging box is built of a number of sections provided with vertical flanges enabling them () together to form two blocks.

A.being bolted
B.bolted
C.bolting
D.to be bolted


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2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題The remaining oil in the lubricating pipes and ducts should be blown out with ().

A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds