【多选题】
A 第一位编码5为类别，代表电子类。
The first digit 5 is the category, indicating the electronics.
B 第一位编码5为类别，代表通讯及信息安全。
The first digit 5 is the category, indicating Communication and information security.
C 第二位编码B为组别，代表测试，检验和生产设备。
The second bit code B is the group, representing the Test, Inspection and Production Equipment
D 第三位编码9为管控原因，代表反恐，犯罪控制，地区安全，供应短缺，联合国制裁等。
The third bit 9, represents Anti-terrorism (AT), Crime Control,Regional Stability, Short Supply, UN Sanctions, etc.
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