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null indicator |
示零器: 23 phrases in 13 subjects |
Automobiles | 1 |
Aviation | 1 |
Communications | 2 |
Computers | 1 |
Earth sciences | 1 |
Electronics | 2 |
Information technology | 1 |
Natural sciences | 1 |
Oil / petroleum | 1 |
Shipbuilding | 1 |
Technology | 9 |
Textile industry | 1 |
Transport | 1 |