单项选择题
A.cylinder covers B.lubricating space C.crosshead D.exhaust manifold
Four strokes consist of suction, compression, （） and ex...
单项选择题Four strokes consist of suction, compression, （） and exhaust stroke.
A.combustion B.condensation C.charging D.evaporation
For one or two types of engine,the piston and rod can b...
单项选择题For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.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
For one or two types of engine, the piston and rod can ...
单项选择题For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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
