單項(xiàng)選擇題For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.
A.the cylinder cover
B.the bottom of bed-plate
C.the sump
D.the crankcase door
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1.單項(xiàng)選擇題For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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
2.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
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