 |
| |||
| 信息组代码 | |||
| 信息块代码 | |||
| ★ 分组码 | |||
| ★ 块码 | |||
| 划区编码; 程序块码; 分批码 | |||
|
block-code : 39 phrases in 11 subjects |
| Business | 1 | Economics | 1 | Space | 9 |
| Communications | 1 | Electronics | 7 | Technology | 7 |
| Computer networks | 2 | Information technology | 6 | Telecommunications | 1 |
| Cryptography | 3 | Rail transport | 1 |