optical variable
| step attenuator
| optical variable | |
| tech. | 光学变星 |
| step attenuator | |
| auto. | 分级 衰减器 |
| avia. од. | 步进衰减器 |
| construct. | 步进 衰减器 |
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| 光学变星 | |||
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optical variable : 14 phrases in 6 subjects |
| Aviation | 1 |
| Electronics | 5 |
| General | 1 |
| Information technology | 1 |
| Oil / petroleum | 1 |
| Technology | 5 |