单项选择题
Which action must be taken when an individual cargo tank is closed off from the inert gas system by the tank isolation valve?（）
A.The tank must be gas freed
B.The tank must be ballasted
C.The tank must be vented to the atmosphere
D.The bypass valve must also be closed
相关考题
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单项选择题
When the dew point of the outside air is lower than or equal to the dew point of the air in the cargo hold，you should（）.
A.secure all ventilation
B.shut down the exhaust blowers
C.shut down the intake blowers
D.ventilate the cargo holds -
单项选择题
When referring to dry bulk cargoes，the term “flow state”（）.
A.designates the state of a commodity when the ship is heeled past the angle of repose
B.relates to the suitability of loading a cargo by flowing down inclined chutes
C.refers to the saturation of a dry bulk product with water to the point where it acts as a liquid
D.relates to the minimum granule size of a particular product where it will flow like a liquid at an angle of 30° -
单项选择题
When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.
A.one meter from the tank bottom and one meter below the tank top
B.one half the ullage of the tank and one meter below the tank top
C.one half the ullage of the tank and one meter above the tank bottom
D.at three meter intervals from the tank top to the bottom
