单选题（）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.ASecurity level 1BSecurity level 2CSecurity level 3DHighest safety level
单选题
（）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
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