單項選擇題

Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.

A.cylinder liners and piston rings
B.main bearings
C.crankpin bearings
D.turboblower

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單項選擇題

Keep compartment （） as the gas given off can be dangerous.

A.well ventilated
B.well clean
C.in good order
D.more room

單項選擇題

It is well known that good lubrication will （） the bearings from becoming overheated.

A.present
B.prevent
C.avoid
D.provide