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单选题
Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
A
Splash
B
Gravity
C
Pressure
D
Bypass
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单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
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PressureD
Bypass
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