单项选择题
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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相关考题
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单项选择题
Keep compartment （） as the gas given off can be dangerous.
A.well ventilated
B.well clean
C.in good order
D.more room -
单项选择题
It is well known that good lubrication will （） the bearings from becoming overheated.
A.present
B.prevent
C.avoid
D.provide -
单项选择题
It is very necessary that each cylinder （） before the charged air is compressed.
A.is scavenged
B.has been scavenged
C.be scavenged
D.was scavenged
