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pulse transmission
| reflection method
| pulse transmission | |
| oil | 脉冲发送 |
| reflection method | |
| chem. | 辰射式探伤法 |
| expl. | 反射波法地震勘探 |
| met. | 反射法; 反射式探伤法 |
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| 脉冲发送 | |||
| 脉冲传输 | |||
| pulse transmission: 25 phrases in 6 subjects |
| Air defense | 2 |
| Electronics | 3 |
| General | 1 |
| Plastics | 1 |
| Space | 3 |
| Technology | 15 |