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.batterned down
单项选择题 Stuffer-braid rope has（）.
单项选择题 Serving is（）.
单项选择题 Separating both blocks of a tackle to prepare it for reuse is called（）.
