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运输航空
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运输航空
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air transportation
运输航空
利用航空器运送旅客、货物、行李或邮件等,进行经营性客货运输的航空活动。是现代社会综合交通体系中的重要组成部分,与铁路、公路、水运和管道运输共同组成国家交通运输系统。
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Center for Research Libraries
Center for Studies of Information Resources, Wuhan University
center for the performing arts
Center for the Protection, Inheritance and Performance of Folk Culture and Art of Bobai County
Center for the Studies of Latin America,Peking University
Center for the Studies of Latin America,Nankai University
center function
centering
centering machine
centering rod
centerless algebra
centerless grinder
centerless grinding
centerless quadric curve
centerless quadric surface
center-limb variation
center line
center-line
center line survey
center manifold
center manifold theorem
center mass system
center method
center of a ball
center of a circle
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