| |||
| 标准频率; ★ 简正频率 | |||
| 正态频率; 正常频率 | |||
|
normal frequency : 27 phrases in 13 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Business | 2 |
| Electronics | 1 |
| Hydrology | 1 |
| International trade | 1 |
| Mathematics | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 3 |
| Selective breeding | 1 |
| Space | 1 |
| Statistics | 1 |
| Technology | 9 |