單項(xiàng)選擇題

Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）

A.Maritime Safety Administration
B.Master of the vessel
C.Chief Engineer
D.Chief Mate

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The rate of heat transfer from a hot region to a cold region is affected most by the （）.

A.size of the heat sink
B.temperature difference between the regions
C.size of the heat source
D.total heat of the system

單項(xiàng)選擇題

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.

A.the four-way control valve failing to shift
B.the bleeder valve sticking in the open position
C.cold hydraulic fluid
D.a clogged air vent falter on the oil reservoir