For defining the QoS policies for each traffic class， which parameters should be identified？ （） ["minimum bandwidth guarantee","average bandwidth guarantee","optimum bandwidth guarantee","maximum bandwidth rate","IP precedence F priority"]
吸附氧在电极表面获得电子进行还原反应，即是氧的（） ["分子化反应","原子化反应","离子化反应","非离子反应"]
我军装备有哪些型号的歼击机？
兰台
某保健食品在广告中表现可补充营养、化解儿童厌食问题，这是一种（） ["悬疑式广告","解决问题式广告","证言式广告","比喻式广告"]
伺服系统的执行电动机有哪几种？
