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secondary electrons | |||
secondary electron | |||
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secondary electron |
二 次电子 : 41 phrases in 12 subjects |
Air defense | 1 |
Automobiles | 1 |
Aviation | 2 |
Construction | 1 |
Earth sciences | 2 |
Electronics | 21 |
General | 2 |
Metallurgy | 2 |
Oil processing plants | 1 |
Radio | 1 |
Space | 2 |
Technology | 5 |