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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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observational data
observational dispersion
observational error
observational learning
observational material
observational method
observational network
observational predicate calculus
observational program
observational project
observational quantity
observational sampling
observational selection
observation and description on external things
observation and imitation of character
observation control system
observation equation
observation error
observation function
observation likelihoods
observation measurements
observation method
observation network at seabed
observation of agrometeorological disasters
observation of crop developmental stages
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