单项选择题
Marine four-stroke diesel engines are mainly （）.
A.of crosshead type
B.of trunk piston type
C.of low speed type
D.all the above
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相关考题
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单项选择题
Main bearings are required to support the crankshaft at each （）.
A.end
B.web
C.pin
D.journal -
单项选择题
Lubricating oil for an engine is stored at the bottom of the （）, known as the sump or in a drain tank located beneath the engine.
A.sea cheat
B.air receiver
C.crankcase
D.water box -
单项选择题
Low compression results from （）.
A.a worn cylinder
B.broken piston rings
C.either A or B
D.none of the above
