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| two-level action; two-position action; two-step action | |||
| high-low level control | |||
| on-off control; snap action; two-position control | |||
| 双位调节: 7 phrases in 5 subjects |
| Astronautics | 1 |
| Electronics | 2 |
| Metallurgy | 1 |
| Plastics | 1 |
| Technology | 2 |
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