问题
单项选择题
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
答案
参考答案：C
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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
参考答案：C