单项选择题
For an ordinary four-stroke engine the inlet valves open （）
A.after TDC
B.before TDC
C.after BDC
D.before BDC
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相关考题
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单项选择题
For an ordinary four-stroke engine the exhaust valves open （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC -
单项选择题
For an ordinary four-stroke diesel engine the exhaust valves close （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC -
单项选择题
For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.
A.a gravity tank
B.a sump
C.a vessel
D.a bottle
