| 1. | Operation and maintenance for magnetotelluric instruments
大地电磁测深仪使用与维护 |
| 2. | A trademark used for a sonic depth finder
回音测深仪一种声音测深仪的商标 |
| 3. | Digital magnetic telluro sounding instrument
数字大地电磁测深仪 |
| 4. | Survey of underwater topography combine rtk gps with digital echosounder
与数字测深仪相结合进行水下地形测量 |
| 5. | Standard practice for calibrating a fathometer using a bar check method
用棒检验方法校准回声测深仪的标准实施规范 |
| 6. | Inspection installation and water tightness transducer of echo sounder on berth
测深仪换能器船台安装和水密性检查。 |
| 7. | Frequency sounding instrument
频率测深仪 |
| 8. | Ultra sonic depth finder
超声波测深仪 |
| 9. | Ultrasonic depth finder
超声波测深仪 |
| 10. | Echo depth sounding sonar
回声测深仪 |
