【单选题】【消耗次数：1】
具有亡羊补牢作用的控制类型是（）
①
同步控制
②
预先控制
③
反馈控制
④
以上三种
参考答案：
复制
纠错
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【简答题】
802.11 帧共有三种类型，分别是控制帧、[填空]和管理帧
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crime; commit; criminal
②
commit; criminal; crimes
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commit; crimes; criminal
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scolded
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charged
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accused
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cost
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cast
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For all
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Above all
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to
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