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
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Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.
A.the call sign and name
B.the official number and name
C.the port of registry and name
D.the port of registry and official number -
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Every state, whether coastal or not,（）to sail ships under its flag on the high seas.
A.has no right
B.has partial right
C.has the right
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How many（）are there altogether?
A.sweeping bag
B.sweepings bag
C.sweeping bags
D.sweepings bags
