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單項選擇題

For an ordinary modem marine four-stroke engine the inlet valves close （）.

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

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單項選擇題

For an ordinary four-stroke engine the inlet valves open （）

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

單項選擇題

For an ordinary four-stroke engine the exhaust valves open （）.

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

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