适合于新闻采集、机价格适中、小巧轻便、机动灵活的摄像机属于().
A. 家用级摄像机
B. 专业级摄像机
C. 广播级摄像机
DV摄像机
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万维网(world wide web)又称为(),是Internet中应用最广泛的领域之一。
A. Internet
B. 全球信息网
C. 城市网
D. 远程网
深井电极应通过()就近焊接到水平网上,搭接长度为圆钢直径的6倍。
气胀式救生筏根据其施放方式不同有()两种。
A. 抛投式救生筏和可吊式救生筏
B. 气胀救生筏和刚性救生筏
C. 传统救生筏和气胀救生筏
Before inserting a new switch in the network,the network administrator checks that the VTP domain name is correct,the VTP mode is set to server, and revision is lower than the switches in the network. The administrator then configures interfaces and trunks,erases existing VLANs,and connects the switch to the network. Following that procedure,there is no connectivity in the network. What is a possible cause of this problem?()
A. Because the configuration revision of the new switches is lower than the rest of the network, it can change the VLAN database of the other switches.
B. As a VTP server, the new switch deleted all VLANs of the network.
C. Erasing VLANs increases the VTP configuration revision.
D. Since the configuration revision of the network is higher than the new switch, the VLAN database was automatically synchronized.