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边界问题 | |||
边值问题 |
boundary problem: 40 phrases in 12 subjects |
Air defense | 1 |
Aviation | 5 |
Business | 1 |
Earth sciences | 3 |
Electronics | 2 |
Engineering geology | 3 |
Hydroelectric power stations | 1 |
Information technology | 1 |
Oil / petroleum | 1 |
Space | 5 |
Technology | 16 |
Wind Energy | 1 |