On a cargo vessel, fire and boat drills must be held within 24 hours of leaving port if the percentage of the crew replaced is more than （）.<br>A:5%<br>B:10%<br>C:25%<br>D:40%

On a cargo vessel, fire and boat drills must be held within 24 hours of leaving port if the percentage of the crew replaced is more than （）.
A:5%
B:10%
C:25%
D:40%

出自：海船船员证

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