问题
单项选择题
After using a CO2 extinguisher on a ship，it should be（）.
A.put back in service if some CO2 remains
B.hydrostatically tested
C.retagged
D.recharged
答案
参考答案：D
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After using a CO2 extinguisher on a ship，it should be（）.
A.put back in service if some CO2 remains
B.hydrostatically tested
C.retagged
D.recharged
参考答案：D