单项选择题
A.3 nm B.6 nm C.12 nm D.25 nm
Open ullage holes in tanks which are not gas-free must ...
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
Oil slick caused by spillage of oil from tanker ship is...
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
No person on board any vessel to which Annex V to MARPO...
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
