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单选题
（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.
A
Except for
B
Beside
C
Except
D
In addition to
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单选题There will usually be summaries or daily account tables for heavy oil, diesel oil, lubricating oil, and fresh water, which will be compiled（）A
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keep excess oil away from intake and exhaust portsD
help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
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单选题How often should the lubricating oil of a diesel engine be changed?（）A
After every tripB
Every 4000 hoursC
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screwC
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