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Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
A:bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversed
B:bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed
C:the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine
D:two-stoke/cycle diesel engines require more complicated lubrication piping

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出自：海船船员证

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