frequency selective
| level indicator
| frequency selective | |
| space | 频率选择; 选频 |
| level indicator | |
| compr. | 水平指示器; 液位指示器 |
| dril. | 液面高度指示器 |
| manag. | 层次表示号 |
| met. | 料位指示器; 液面指示器 |
| oil | 层次指示符; 水平仪; 调平指示器 |
| oil.proc. mining. | 液位 指示器 |
| |||
| 频率选择; 选频 | |||
| |||
| 频率选择的 | |||
|
frequency selective : 48 phrases in 10 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Communications | 6 |
| Electronics | 11 |
| Geophysics | 1 |
| Information technology | 2 |
| Nautical | 2 |
| Space | 11 |
| Technology | 7 |
| Telecommunications | 3 |