单项选择题
Vessels carrying（）must not willfully wash decks or holds.
A.general cargo B.steel products C.harmful cargo D.machinery
单项选择题 Vessels must be（）valid certificate of nationality or certificated of registry or license.
单项选择题 Vessels must not “exceed” a speed of 8 knots in this area.（）.
单项选择题 We can hardly accept any marks（）or damage（）the cargo.
