_______means the level for which appropriate addit
_______means the level for which appropriate additional protective security measures shall be maintained for a period of time as a result of heightened risk of a security incident.
A.Security level 1
B.Security level 2
C.Security level 3
D.Security level 4
请帮忙给出正确答案和分析，谢谢！
参考解答
4j7***779
2024-06-14 19:50:57
正确答案：B
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