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| 一阶矩; 一次矩 | |||
| 一阶动差 | |||
| 第一势差 | |||
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| 一次矩; 一阶矩 | |||
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first moment : 23 phrases in 9 subjects |
| Automobiles | 1 |
| Bridge construction | 5 |
| Business | 1 |
| Earth sciences | 4 |
| Hydroelectric power stations | 3 |
| Space | 1 |
| Sports | 2 |
| Statistics | 2 |
| Technology | 4 |
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