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.

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（）.