单项选择题
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
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（）.
单项选择题 When referring to dry bulk cargoes，the term “flow state”（）.
单项选择题 When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.