first-order second moment
| method
| first order second moment abbr. | |
| space | 一次二阶矩 |
| method abbr. | |
| gen. | 法; 标准; 水平 |
| environ. | 方法 |
| hydroel.st. од. | 方法 |
| mech. | 电火花法 |
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| 一次二阶矩 | |||
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first-order second moment : 7 phrases in 3 subjects |
| Earth sciences | 4 |
| Hydroelectric power stations | 2 |
| Technology | 1 |