When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?()
A. when all switches have the same BID as the root switch
B. when all switches have received the MAC address of each neighboring switch
C. when every enabled switch port has been assigned a unique identifier
D. when every operating switch port is in either the blocking or forwarding state
E. when all switches are in either client, server, or transparent mode
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烟草制品批发企业的设立和烟草制品生产企业固定资产投资审批的法律依据均是()
可疑最迟在系统提取的()自然日(含)内补录。
A. 1
B. 3
C. 5
D. 10
关于下肢骨的组成,除哪一项外都是正确的描述()
A. 一侧下肢骨有31块
B. 分为下肢带骨和自由下肢骨两部分
C. 下肢带骨即为髂骨
D. 自由下肢骨包括股骨,胫骨,腓骨,髌骨,足骨
压力容器投用后首次内外部检验周期一般为()年。
A. l
B. 3
C. 6