frequency comparison
| method
| frequency comparison abbr. | |
| el. | 频率比较 |
| oil | 频率对比 |
| method abbr. | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 频率比较 | |||
| 频率对比 | |||
| 频率比对 | |||
|
frequency comparison : 7 phrases in 5 subjects |
| Air defense | 2 |
| Business | 1 |
| Economics | 1 |
| Electronics | 2 |
| Oil / petroleum | 1 |