Marine four-stroke diesel engines are mainly （）.

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[单选题]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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[单选题]At least （） cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.

A. 6
B. 2
C. 12
D. 8

[单选题]Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the （）.

A. main bearings
B. connecting rod bearings
C. piston pin bushings
D. All of the above

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