trap volume
| method
| trap volume | |
| oil | 圈闭容积 |
| method | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 圈闭容积 | |||
|
trap volume : 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Technology | 1 |