【单选题】【消耗次数：1】
将传输比特流划分为帧，应属于下列OSI的哪一层处理？
①
物理层
②
数据链路层
③
传输层
④
网络层
参考答案：
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综合 OSI 和 TCP/IP 参考模型的优点，五层协议的体系结构，分别包含物理层、数据链路层、网络层、运输层和[填空]
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已知某种型号的雷管在一定刺激下发火率为1/5，今独立重复地作刺激试验，直到发火为止，则消耗的雷管数为3的概率为（）。
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1/125
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4/125
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3
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2
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<imgsrc="http://121.251.253.213/doc/a@4694669459F98E149B804A104B651936.png/download?time=636002388033637975&token=7717EBCF989826B9F937ADD750BA053E&filename=png"data-preview_url_ueditor="doc/a@4694669459F98E149B804A104B651936.png"data-url="doc/a@4694669459F98E149B804A104B651936.png"/>
①
<imgsrc="http://121.251.253.213/doc/a@7EFEDE86BAD9C681AE62991E99C4662F.png/download?time=636002388171386217&token=009F46715F7C1A9E4906033D77BCD786&filename=png"data-preview_url_ueditor="doc/a@7EFEDE86BAD9C681AE62991E99C4662F.png"data-url="doc/a@7EFEDE86BAD9C681AE62991E99C4662F.png"/>
②
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③
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④
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3/4
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3/16
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①
1/3
②
1/4
③
1
④
1/2
【单选题】
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①
0.4
②
0.6
③
0.28
④
0.72
【单选题】
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①
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②
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③
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④
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