The soda-acid portable extinguishers must be discharged and refilled （）.<br>A:every six months<br>B:every year<br>C:every one and half year<br>D:every two years

The soda-acid portable extinguishers must be discharged and refilled （）.
A:every six months
B:every year
C:every one and half year
D:every two years

出自：海船船员证

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