area frame
| method
| area frame | |
| stat. | 区域 框架 |
| method | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
| |||
| 区域抽样框架 | |||
|
area frame : 10 phrases in 6 subjects |
| Agriculture | 1 |
| Earth sciences | 1 |
| Electric machinery | 1 |
| Space | 1 |
| Technology | 5 |
| Water resources | 1 |