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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单项选择题
When preparing an engine for water temperature（）

A.should be kept at a proper level by a cooler
B.should be raised to about 80℃ by a heater
C.should be raised gradually
D.should be lowered to about 60℃
单项选择题
When stand-by engine instructions have been received, it’s necessary to make it sure that all valves in the various systems are（）

A.operational
B.open
C.closed securely
D.at middle position
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