2. 外语
  3. A—air traffic control system J—safety precaution measure B—armed police K—safety control device C—crime prevention L—security

A—air traffic control system J—safety precaution measure B—armed police K—safety control device C—crime prevention L—security

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问题 A—air traffic control system  J—safety precaution measure
B—armed police  K—safety control device
C—crime prevention  L—security command center
D—entry requirement  M—security service
E—international criminal police organization  N—security control center
F—level of security  O—security personnel
G—picket line  P—valid documents
H—police station  Q—security monitoring and control
I—patrolling vehicle
Examples：(M)保安服务    (G)警戒线
(    )入境要求    (    )安保人员
选项
答案D，O
解析
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