（）means the level for which further specific protective security measures shall be maintained for a limited period of time when a security incident is probable or imminent, although it may not be possible to identify the specific target.<br>A:Security level 1<br>B:Security level 2<br>C:Security level 3<br>D:Highest safety level

（）means the level for which further specific protective security measures shall be maintained for a limited period of time when a security incident is probable or imminent, although it may not be possible to identify the specific target.
A:Security level 1
B:Security level 2
C:Security level 3
D:Highest safety level

出自：海船船员证

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