单选题The oil pressure and flow from each bearings can be checked when（）Athe lubricating pumps are stopped and the access doors are openedBthe lubricating pumps are running and the access doors are openedCthe engine is running and the access doors are closedDthe engine is stopped and the access doors are closed
单选题
The oil pressure and flow from each bearings can be checked when（）
A
the lubricating pumps are stopped and the access doors are opened
B
the lubricating pumps are running and the access doors are opened
C
the engine is running and the access doors are closed
D
the engine is stopped and the access doors are closed
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