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实施药物过敏试验前，应询问的‘三史’

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药物过敏试验阳性者，需要注明药物过敏试验的阳性反应，包括

碘过敏试验的方法有

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.

简要回答TCP协议和UDP协议的区别。