单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

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