单项选择题
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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B.should be raised to about 80℃ by a heater
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