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单选题
The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the （） cycle.
A
two-stroke
B
four-stoke
C
long-stroke
D
short-stroke
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单选题（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.A
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单选题The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）A
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is usually cooled by sea waterB
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can t expand when heated
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crankcaseB
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valve coverD
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单选题Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.A
leadB
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Engine is hard to startB
Engine missesC
Surges at governed RPMD
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Electric starting motorsB
HydraulicsC
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