单项选择题 Oil slick caused by spillage of oil from tanker ship is（）.

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（）.

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.