单项选择题
In setting the valves on a steam-smothering system on a tanker，the master control valve to cargo tanks should be（）.
A.open and individual tank valves open
B.open and the individual tank valves closed
C.closed and the individual tank valves closed
D.closed and the individual tank valves open
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相关考题
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单项选择题
In order to reduce the accumulation of static electricity while loading petroleum products，you should（）.
A.start to load at maximum pressure
B.start to load slowly
C.increase the air flow into the tank
D.use the overall method of loading only -
单项选择题
If you are bunkering and you close off one tank in the line of tanks being filled，the rate of flow to other open tanks on the same line will（）.
A.increase
B.decrease
C.stop
D.remain constant -
单项选择题
How must each storage tank for helicopter fuel on a ship be marked?（）
A.DANGER - KEEP AWAY
B.DANGER - EXPLOSIVE VAPORS
C.DANGER - NO SMOKING
D.DANGER - FLAMMABLE LIQUID
