Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.<br>A:when the remaining charge volume is less than 90 percent of the required VOLUME<br>B:at each inspection for certification<br>C:at each annual inspection<br>D:when the weight loss exceeds 10% of weight of charge

Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.
A:when the remaining charge volume is less than 90 percent of the required VOLUME
B:at each inspection for certification
C:at each annual inspection
D:when the weight loss exceeds 10% of weight of charge

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