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单选题
An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）
A
graphite packing
B
sealing compound
C
lubricating oil
D
gaskets
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单选题Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.A
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单选题Low compression pressure in a diesel engine can be caused by（）A
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单选题The cylinder covers and the liners are bolted together by means of （）.A
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bolts welded into the cylinder framesC
studs screwed into the cylinder headD
studs screwed into the cylinder frames
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