题目内容

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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合成炉防爆膜发生爆炸该如何处理？

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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

合成炉防爆膜发生爆炸该如何处理？

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This Certificate will remain in force until May 1，2009. （）.

A. cylinder liners and piston rings
B. main bearings
C. crankpin bearings
D. turboblower