单项选择题
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（）.
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.
单项选择题 In case of a ship of less than 400 tons gross tonnage other than an oil tanker whist outside the（），the Administration shall ensure that it is equipped as far as practicable and reasonable with installations to ensure the storage of oil residues with the requirements of MARPOL 73/78.