单项选择题
A. Start each fire pump B. Launch and run a lifeboat C. Inspect fire hoses D. Close each fire pump
（）are used for lifesaving .A. Life-jacket and lifebuoyB...
单项选择题（）are used for lifesaving .
A. Life-jacket and lifebuoy B. Freeboard C. Telemeter D. Draft
Oil fires are best extinguished by （）.A. cutting off th...
单项选择题Oil fires are best extinguished by （）.
A. cutting off the supply of oxygen B. removing the fuel C. spraying with water D. adding oxygen
You will extinguish a fire when you remove （）.A.oxygenB...
单项选择题You will extinguish a fire when you remove （）.
A.oxygen B.carbon dioxide C.H2O D.H2
