單項(xiàng)選擇題Which of the fire extinguishers listed is to be weighed annually and sent ashore for recharging if the weight loss exceeds 10% of the weight of a full charge?()

A.Foam
B.Soda acid
C.Dry chemical
D.Carbon dioxide


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1.單項(xiàng)選擇題A carbon dioxide fire extinguisher has been partially discharged, and should be immediately ().

A.tagged and restowed properly in its rack
B.weighed and the charge loss recorded
C.given to the chief engineer for recharging
D.tagged "empty" and stowed separately from charged extinguishers

2.單項(xiàng)選擇題Which of the listed fire extinguishers cannot be easily recharged aboard ship?()

A.Soda acid
B.Carbon dioxide
C.Dry chemical
D.Cartridge-operated Foam

3.單項(xiàng)選擇題When checking the liquid level in a tank, you should position yourself ().

A.on the windward side of the opening
B.on the leeward side of the opening
C.at a right angle to the wind direction
D.so that the obstruction of your body will protect you from the fumes

4.單項(xiàng)選擇題The stability of a vessel is normally the greatest when all fuel and water tanks are full because the ().

A.center of gravity is lowered
B.center of buoyancy is lowered
C.reserve buoyancy is unchanged
D.hull freeboard is increased

5.單項(xiàng)選擇題Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?()

A.The agent is considered nontoxic at room temperature in low concentrations
B.The agent is less effective than carbon dioxide
C.Halon primarily extinguishes the fire by cooling
D.The agent cannot be used on electrical fires because it leaves a residue