Proper lubrication of the main bearing is more easily obtained in a single acting four-str

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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-strokecycle acting single diesel engine is continually reversed

B.bearing pressure in a two-strokecycle 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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热搜:a是b的充分条件,b是a的必要条件吗