stack time
| efficiency
| stack time | |
| met. | 鼓风时间 |
| efficiency | |
| adv. | 广告效果 |
| agric. | 效能 |
| auto. | 效率; 功 效; 功 率 |
| hydroel.st. | 效能 |
| interntl.trade. од. | 有效性 |
| math. | 有效性，效益 |
| met. | 效果 |
| radio.amat. од. | 效率 |
| |||
| 鼓风时间 (转炉的) | |||
|
stack time : 8 phrases in 5 subjects |
| Electronics | 1 |
| Geophysics | 2 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Technology | 2 |