单选题A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.Aused at the earliest opportunityBhydrotestedCrechargedDweighed again in one month
单选题
A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.
A
used at the earliest opportunity
B
hydrotested
C
recharged
D
weighed again in one month
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