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| 能量不灭定律 | |||
| 能量守恒定律 | |||
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law of energy conservation : 9 phrases in 6 subjects |
| Aviation | 1 |
| Chemistry | 2 |
| Corporate governance | 1 |
| Hydroelectric power stations | 1 |
| Technology | 3 |
| Wind Energy | 1 |
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