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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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prevent the pressure before it over the specified valveC
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Too much sludge accumulated in separator bowlB
Diameter of gravity disc too largeC
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involves a lot of technological problemsB
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tankB
sumpC
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bottle
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