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preselection | |||
pre-selector | |||
preselector | |||
line switch | |||
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YIG preselector | |||
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preselector | |||
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preselector | |||
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preselector | |||
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preselector |
预选器 : 28 phrases in 7 subjects |
Air defense | 1 |
Automobiles | 5 |
Electronics | 2 |
Mechanic engineering | 1 |
Space | 2 |
Technology | 16 |
Water resources | 1 |