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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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单选题Diesel engines are considered safer than gasoline engines because（）.A
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单选题Today, crankshafts for large 2-stroke crosshead engines are of the （）type.A
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单选题The crankshafts on the large modern 2-stroke crosshead engines are （）big （）makes as a single unit and so are constructed by joining together individual forgings.A
enough；toB
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almost invariably solid forgedD
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