单项选择题
Sufficient cargo tanks shall be（）prior to each ballast voyage in order that，taking into account the tanker’s trading pattern and expected weather conditions，ballast water is put only into cargo tanks which have been crude oil washed.
A.Inerted B.Crude oil washed C.Gas freed D.Battened down
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 In which case is the IOPP Certificate of an inspected vessel NOT invalidated（）.
单项选择题 Every（）shall be fitted with a cargo tank cleaning system using crude oil washing.
