单项选择题

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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单项选择题

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

A.an air start cam
B.cylinder compression pressure
C.starting air pressure
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For a diesel engine, individual cylinder performance is commonly determined by exhaust gas（）

A.chemical analysis
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B.excessive mechanical clearance between the piston crown and cylinder head
C.excessively worn fuel pump plunger
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