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脚背正面接球的技术要领是什么?

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实施药物过敏试验前，应询问的‘三史’

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将下列句子翻译成汉语Air traffic control (ATC) is a service provided by ground-based controllerswho direct aircrafton the ground and in the air. The primary purpose of ATC systems worldwide is to separate aircraft to prevent collisions, to organize and expedite the flow of traffic, and to provide information and other support for pilots when able.