單項選擇題

For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.

A.cylinder casing
B.cylinder bore
C.crankcase door
D.aperture in the cylinder block

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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

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