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[单选题]Generally the gudgeon pin is fully floating in both connecting rod small end and ().
A. the crosshead
B. the crankshaft
C. large end
D. the piston bosse
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[单选题]() fuel oils () lubricating oils require treatment before passing to the engine.
A. Both;and
B. Neither;nor
C. Either;or
D. Both;or
[单选题]The sealing rings are in four parts and pressed together around the piston rods by means of ().
A. nuts
B. bolts
C. coil springs
D. stuffing boxe
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