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單項(xiàng)選擇題

A gas-free certificate would usually be issued by a (n)（）.

A.CCS marine surveyor
B.certified marine chemist
C.port engineer
D.HAS marine inspector

單項(xiàng)選擇題

A half-height container is used（）.

A.to carry cargoes of low density
B.when stowage space is limited
C.to carry cargoes such as steel products or drums
D.to double the stowage capacity of the vessel