單項選擇題Four strokes consist of suction, compression, （） and exhaust stroke.
A.combustion
B.condensation
C.charging
D.evaporation
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1.單項選擇題For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.
A.the cylinder cover
B.the bottom of bed-plate
C.the sump
D.the crankcase door
2.單項選擇題For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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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