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| 催查制度; 连续通讯; 劝购法 | |||
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| 连续跟踪推销法; 连续推销法; 伺服系统 | |||
| 连续推销制 | |||
| 连续制 | |||
| 跟踪系统 | |||
| 跟踪随动系统 | |||
| 随动［跟踪］系统 | |||
| 随动系统 | |||
| 从动系统; 跟随系统 | |||
| follow -up system: 17 phrases in 6 subjects |
| Aviation | 3 |
| Electronics | 4 |
| Information technology | 1 |
| Refrigeration | 1 |
| Space | 2 |
| Technology | 6 |
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