單項選擇題The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

A.so a height
B.such a height
C.so high
D.such high


您可能感興趣的試卷

你可能感興趣的試題

1.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

2.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

3.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

4.單項選擇題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

5.單項選擇題The quantity of oil injected into the cylinder can be regulated （）.

A.by turning the pump plunger
B.by vary the fuel valve spring force
C.by no means by controlling the governor
D.by enlarging or diminishing the injection hole