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| protection against aircraft | |||
| air-raid precautions | |||
| antiaircraft measures | |||
| air defence measures | |||
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| air-raid precautions | |||
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防空措施 : 5 phrases in 4 subjects |
| Aviation | 1 |
| General | 1 |
| Hydroelectric power stations | 1 |
| Space | 2 |
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