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| Planck constant | |||
| elementary quantum | |||
| Planck's constant | |||
| Planck constant (量子理论基本定律中的一个常数) | |||
| Plank's constant | |||
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| Planck contant; Planck's contant | |||
| 普 朗克常数: 3 phrases in 2 subjects |
| Electronics | 2 |
| Technology | 1 |
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