單項(xiàng)選擇題For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題For an ordinary four-stroke diesel engine the exhaust valves close （）.

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

5.單項(xiàng)選擇題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