题目内容

根据生成树协议，每个网段会有一个指定端口，这个端口是_____的。除此之外的该网段上的所有端口都处于阻塞状态

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Asking questions also gives you the opportunity to _______ if this is the right place foryou.

A. find in
B. find with
C. find out

请描述生成树协议的工作原理

There are many ___to do so for the participants.

A. thing
B. benefits
C. strive

Browsing_ _ the classified ads and applying for every job you find is not enough.

A. with
B. for
C. through