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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 31508-2015 |
Information security techniques—Public key infrastructure—Digital certificate policies classification and grading specification 信息安全技术 公钥基础设施 数字证书策略分类分级规范 |
China National Standards Format classification digital |
 English PDF |
| GB/T 15521-1995 |
Format and classification of digital audio tape cassette system (DAT) used for broadcasting 广播用数字音频盒式磁带系统(DAT)格式及分类特性 |
China National Standards Format classification digital |
English PDF |
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