【多选题】【消耗次数：1】
关于利用率，说法正确的是（ ）
①
分为网络利用率和信道利用率
②
信道利用率越大，时延也就越大
③
信道利用率不可能接近100%
④
信道利用率达到50%时，时延就是空闲时时延的2倍
参考答案：
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相关题目
【单选题】
以太网线路利用率，说法错误的是（）
①
要提高以太网的信道利用率，就必须减小?与T0之比
②
以太网的帧长不能太短，否则利用率会太低。
③
当以太网的利用率达到30%时就已经处于重载的情况。
④
只有当参数a远大于1才能得到尽可能高的极限信道利用率。
随机题目
【单选题】
下列食物中属于优质蛋白的是( )。
①
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大米
②
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豆腐
③
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mso-bidi-theme-font:minor-bidi;
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山药
④
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年糕
【单选题】
椅深实质椅面前后的长度，合适的椅深为（ ）
①
儿童大腿的后3/4应置于椅面上
②
儿童大腿的后1/2应置于椅面上
③
儿童大腿的4/5应置于椅面上
④
儿童小腿的后面不留空隙
【单选题】
佝偻病的发生是由于缺乏（ ）．
①
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②
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③
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④
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【单选题】
下列哪种方式是幼儿老师与家长谈话交往时较好的方式（ ）。
①
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谈话时不涉及别的孩子，以平等的身份采用日常用语与家长交谈
②
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只是向家长报告孩子的优点，让家长高兴
③
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对存在问题的孩子，向家长指出他们的教育观有问题
④
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只是向家长谈幼儿的问题，要家长注意或配合教育孩子
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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