A.the suction stroke
B.the compression stroke
C.the expansion stroke
D.the exhaust stroke
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A.up；opened
B.down；open
C.up；closed
D.down；closed
A.two strokes of the piston
B.four strokes of the piston
C.one revolution of the crankshaft
D.four revolutions of the crankshaft
A.crosshead
B.crown
C.piston rod
D.connecting rod
A.higher；reduced
B.higher；increased
C.lower；reduced
D.lower；increased
A.Diesel engine propulsion
B.Diesel electric propulsion
C.Steam engine propulsion
D.Gas turbine propulsion
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