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- congresses (2)
- automatic checkout equipment (1)
- automatic control (1)
- data transmission systems (1)
- digital electronics (1)
- engineering instruments (1)
- optoelectronics (1)
- power (mechanics) (1)
- pulse-code modulation (1)
- 单片微型计算机 (1)
- 教材 (1)
- 高等学校 (1)
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