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【单选题】
网桥用于连接两个或多个物理网段，可以称得上是一种真正意义上的网络互连设备。它工作在OSI参考模型中（）层，主要进行帧的存储和转发。A.
物理层
B.
应用层
C.
网络层
D.
数据链路层
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举一反三
【简答题】My Experience in a Free School At first I couldn't believe it! There were no __26 in rows; no bells rang; no one had to go to _ _27 . Although we all lived “in”, __28 made us go to bed at a certain ti...
【简答题】Everyone would like to be remembered. A few people even try to do something that no one else in history has ever tried to do. These people sometimes have their names recorded in the Guinness Book of R...
【单选题】From: Ethel Montgomery (ethelmontgomery@easymail.com) To: Customer Care (customer@comfortlevel.com) Subject: Customer Guarantee Date: January 28, 5:49 a.m. To Whom It May Concern: My name is Ethel Mon...
A.
It can fold into a large sofa.
B.
It carries a 10-year repair warranty.
C.
The level of firmness can be adjusted.
D.
It can be moved to an upright position
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