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Regulations require that cargo tanks in which grades B or C liquids are carried must be vented with which of the following ________．
A.Gooseneck vents
B.Flame screens
C.Pressure vacuum relief valves
D.Forced draft blowers
参考答案
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单选题Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolatedfrom sources of vapor ignition by（）.A
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pressure-vacuum relief valvesC
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单选题In no case shall ballast water be carried in cargo tanks，（）on those rare voyages when weather conditions are so severe that，in the opinion of the master，it is necessary to carry additional ballast water in cargo tanks for the safety of the ship.A
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except
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单选题When carrying a cargo of asphalt or molten sulfur，which are carried at temperatures of over 300°F，one of the biggest dangers is（）.A
water in the tanks or pipelinesB
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explosion of vapors after dischargeD
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单选题To determine which grades of cargo a tanker is permitted to carry you should（）.A
refer to the vessel's Certificate of InspectionB
examine the cargo tanks and fittingsC
ask the terminal supervisor or his representativeD
check the loading order
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inertedB
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pump roomsD
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单选题Regulations require that tank vessels handling grade B liquids shall have their cargo pumps separated from all sources of vapor ignition by（）.A
cofferdamsB
empty cargo spacesC
gas tight bulkheadsD
areas equipped with power ventilation
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