Which step is NOT generally taken when gas-freeing a tank?（）.

单项选择题Which statement is TRUE concerning the ventilation of engine and fuel tank compartments on uninspected towing vessels using fuel with a flash point of 100°F?（）

A.There shall be at least 3 ventilator ducts open to the atmosphere
B.At least one exhaust duct shall extend from the open atmosphere to the lower portion of the bilge
C.At least one intake duct shall extend from the open atmosphere to the lower portion of the bilge
D.Only vessels using fuel with a flash point above 110°F need ventilate engine and fuel compartments

单项选择题Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）

A.Each vent for the tank must be equal to the area of the tank filling line
B.The tanks must be protected by overflows
C.The total area of the vents or the overflow shall be at least equal to the area of the fill line
D.There must be twice as much vent area as the area of the fill line

单项选择题Which is an exception to the garbage discharge requirements in Annex V to MARPOL 73 78?（）

A.The garbage to be discharged will sink
B.Garbage accumulation on board has exceeded storage space
C.A person falls overboard，and a plastic ice chest is thrown for flotation
D.The destination port or terminal cannot receive garbage

单项选择题Which area is designated a special area by Annex V to MARPOL 73 78? （）

A.Gulf of Mexico
B.Sargasso Sea
C.Red Sea
D.Great Lakes

单项选择题Whenever visible traces of oil are observed on or below the surface of the water in the immediate vicinity of ship or its wake，Governments of Parties to the Convention should，to the extent they are reasonably able to do so，promptly（）the facts bearing on the issue of whether there has been a violation of the provisions of this Regulation or Regulation 10 of this Annex of MARPOL 73 78.

A.observe
B.investigate
C.see
D.look