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民用航空
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民用航空
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民用航空
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civil aviation
民用航空
使用航空器从事除了国防、警察和海关等国家航空活动以外的航空活动。分为运输航空和通用航空两部分。简称民航。
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woodworking drilling machine
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Woodworking Milling
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Woodworking Portable Machinery
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woody activated carbon
Woody activated carbon fiber
Woody Allen
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