单项选择题

Open ullage holes in tanks which are not gas-free must be protected by（）.

A.PV valves
B.warning signs
C.flame screens
D.stop-check valves

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单项选择题

Oil slick caused by spillage of oil from tanker ship is（）.

A.a drop of oil
B.the emulsion of oil at sea surface
C.the weathered oil
D.the oil floating on the surface of the sea water

单项选择题

No person on board any vessel to which Annex V to MARPOL 73/78 applies may discharge garbage of any type when（）.

A.less than 12 nautical miles from PRC
B.less than 12 nautical miles from nearest land
C.in the navigable waters of the PRC
D.less than 25 nautical miles from nearest land

单项选择题

No discharge into the sea shall contain（）in quantities or concentrations which are hazardous to the marine environment or chemicals or other substances introduced for the purpose of circumventing the conditions of discharge specified in MARPOL 73/78.

A.chemicals
B.chemicals or other substances
C.substances
D.other substances