A CO2 extinguisher on a ship which has lost 10% of its charge must be（）. A:used at the earliest opportunity B:hydro-tested C:recharged D:weighed again in one month

A CO₂ extinguisher on a ship which has lost 10% of its charge must be（）.
A:used at the earliest opportunity
B:hydro-tested
C:recharged
D:weighed again in one month

出自：海船船员证

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