A.be jammed
B.be opened
C.be seated
D.be broken
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A.more water contents
B.contamination with fuel oil
C.higher temperature
D.sufficient cooling of oil mist
A.is always less than 100%
B.is always more than 100%
C.is always equal to 90%
D.is always less than 90%
A.principle
B.principal
C.cause
D.case
A.two-stroke
B.four-stoke
C.long-stroke
D.short-stroke
A.bedplate, connecting rods
B.crankshaft, the connecting rods
C.frames, crossheads
D.crankshaft, the cylinder
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