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运行合格审定
国家民用航空管理部门按照法律、法规和民用航空规章对民用航空运营实施行政许可的活动。
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undervalue
undervoltage protection
undervoltage release
underwater acoustical detection
underwater acoustical localization
underwater acoustic communication
underwater acoustic communications
underwater acoustic communication, underwater acoustic telemetry
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underwater acoustic detection technology
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underwater acoustic metrology
underwater acoustic network
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underwater acoustic sensing technology
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under water active inflation
underwater adhesive
underwater anti-biofouling
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