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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

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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

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

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