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| 电荷质量比; 荷质比; 装药质量比; 装药系数 (装药质量与发动机质量之比); 电荷质量比 | |||
| charge-to-mass ratio: 6 phrases in 4 subjects |
| Electronics | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 2 |
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