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单选题
What is the crank angle between any two crank throws in the firing order of a four-stroke/cycle, in line, eight cylinder diesel engine?（）
A
45
B
60
C
90
D
100
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单选题Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.A
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单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.A
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名词解释题crank
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