單項選擇題

（）are used for lifesaving .

A. Life-jacket and lifebuoy
B. Freeboard
C. Telemeter
D. Draft

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單項選擇題

Oil fires are best extinguished by （）.

A. cutting off the supply of oxygen
B. removing the fuel
C. spraying with water
D. adding oxygen

單項選擇題

You will extinguish a fire when you remove （）.

A.oxygen
B.carbon dioxide
C.H₂O
D.H₂