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單項(xiàng)選擇題

In a four-stroke cycle diesel engine the intake valves open （）

A.before TDC and close after BDC
B.after TDC and close after BDC
C.before TDC and close before BDC
D.after TDC and close before BDC

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單項(xiàng)選擇題

Diesel engine air start system check valves are opened by （）

A.an air start cam
B.cylinder compression pressure
C.starting air pressure
D.valve springs

單項(xiàng)選擇題

For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）

A.chemical analysis
B.back pressure readings
C.pyrometer readings
D.infrared analysis

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