Halogenated hydrocarbon， Halon in short form，is used on board ship as ________ ．
A. fire-extinguishing medium
B. a standard fire test
C. a non-combustible material
D. a fire main
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Freeboard is a measure of which of the following？Ⅰ．The amount of reserve buoyancy．Ⅱ．The initial stability of the vessel．
A. Ⅰ only
B. Ⅱ only
C. Both Ⅰ and Ⅱ
D. Neither Ⅰ nor Ⅱ
Goods may be dangerous not merely by reason of the fact that they may endanger the safety
A. detain
B. be detained
C. be detaining
D. detains
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