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| centre-of-mass system | |||
| center of mass system | |||
| center of mass frame | |||
| 质 心 系: 16 phrases in 11 subjects |
| Aviation | 2 |
| Bridge construction | 1 |
| British usage, not spelling | 1 |
| Electronics | 2 |
| General | 1 |
| Geology | 1 |
| Metallurgy | 2 |
| Navigation | 1 |
| Physics | 1 |
| Space | 1 |
| Technology | 3 |
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