单项选择题

（） is fully floating in both connecting rod small end and the piston skirt.

A.The piston rod
B.The cross head pin
C.The gudgeon pin
D.The crank-pin

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（） is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank.

A.A filter
B.A centrifuge
C.A distiller
D.A generator
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（） is a source of power by which the diesel engine may operate.

A.Water energy
B.Electrical energy
C.Chemical energy
D.Heat energy
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