A.longitudinal girders
B.transverse girders
C.fore girders
D.aft girders
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A.longitudinal girders
B.transverse girders
C.fore girders
D.aft girders
A.charging
B.super charging
C.scavenging
D.exhausting
A.the suction stroke
B.the compression stroke
C.the expansion stroke
D.the exhaust stroke
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
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