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| 计数管 | |||
| 电子注开关管 | |||
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counting tube : 18 phrases in 9 subjects |
| Business | 1 |
| Chemistry | 1 |
| Electronics | 1 |
| Engineering geology | 2 |
| Laboratory equipment | 1 |
| Metallurgy | 2 |
| Oil / petroleum | 1 |
| Space | 3 |
| Technology | 6 |
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