单选题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 （）Abearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedBbearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedCthe maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineDtwo-stoke/cycle diesel engines require more complicated lubrication piping
单选题
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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