单项选择题
Dry cargoes are those commodities that（）.
A.never leak but may be spoiled by leakage B.sometimes leak and damage themselves C.often leak and damage other cargo D.neither leak nor will be damaged by leakage
单项选择题 Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.
单项选择题 Every state, whether coastal or not,（）to sail ships under its flag on the high seas.
单项选择题 How many（）are there altogether?
