单项选择题
Four strokes consist of suction, compression, （） and exhaust stroke.
A.combustion
B.condensation
C.charging
D.evaporation
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相关考题
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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For one or two types of engine,the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through （）.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 -
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For one or two types of engine, the piston and rod can be withdrawn downwards from the cylinder into the crankcase and then out through the （）.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 -
单项选择题
For an ordinary modem marine four-stroke engine the inlet valves close （）.
A.after TDC
B.before TDC
C.after BDC
D.before BDC
