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?（）<br>A:Foam<br>B:Soda acid<br>C:Dry chemical<br>D:Carbon dioxide

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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