單項(xiàng)選擇題Regulations require that pumprooms on tank vessels carrying grade C liquid cargo with machinery spaces below the freeboard deck be ventilated with（）.

A.power ventilation
B.gooseneck vents and flame screens
C.at least two ducts extending to the weather deck
D.a vent header system


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1.單項(xiàng)選擇題Regulations require that cargo tanks carrying grades D or E liquids on tank barges be vented with（）.

A.gooseneck vents and flame screens
B.pressure-vacuum relief valves
C.branch vent lines and a vent header
D.forced draft blowers

2.單項(xiàng)選擇題Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.

A.cofferdams
B.gastight bulkheads
C.passageways or living quarters
D.general cargo spaces

4.單項(xiàng)選擇題Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.

A.a subsequent temperature rise will cause the cargo to overflow
B.air pockets may cause the cargo to bubble out of the ullage hole
C.the increased viscosity of the product requires higher loading pressure which increases the chances of a spill
D.the tank valve may be stiff and a spill will occur before the valve can be closed

5.單項(xiàng)選擇題One of the principal dangers inherent in liquefied petroleum gas is（）.

A.as it warms up it becomes heavier than air
B.the way it reacts with sea water
C.the strong odor it produces
D.its low temperature causes frostbite or freezing