【单选题】
根尖切除术的适应证为___
A. 根管充填不完善,根尖周′病变久治不愈
B. 器械折断于根管内,堵塞不通
C. 慢性根尖周脓肿
D. 根尖周囊肿
E. 牙周病变涉及根尖周组织
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答案
B
解析
暂无解析
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【单选题】
急性牙槽脓肿发展过程经历的三个临床阶段为___
A. 浆液期、化脓期、引流期
B. 根尖脓肿、骨膜下脓肿、黏膜下脓肿
C. 根尖脓肿、根尖肉芽肿、根尖周囊肿
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E. 急性根尖炎,慢性根尖炎、慢性牙槽脓肿
【单选题】
根管预备常用的器械是___
A. 根管锉、球钻、根管扩大器
B. 扩孔钻、根管扩大器、根管侧压器
C. 裂钻、根管扩大器、拔髓针
D. 机用扩孔钻、根管锉、拔髓针
E. 机用扩孔钻、根管锉、根管扩大器
【单选题】
QUESTION 2 IP报文头部中有一个TTL字段,关于该字段说法正确的是()。___
A. 该字段用来表示数据包的优先级
B. 该字段长度为7位
C. 该字段用于数据包防环
D. 该字段用于数据包分片
【单选题】
QUESTION 3 网络管理员在路由器设备上使用了TracertRoute功能后,路由器发出的数据包中,IPv4首部的Protocol字段取值为?___
A. 6
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C. 17
D. 2
【单选题】
QUESTION 4 如下图所示,现要求主机C只能和主机A或者主机B其中的一台设备通信,那么在SWB的G0/0/3端口下配置 那条命令可以实现这个需求?___
A. mtu 2000
B. port link-type trunk
C. speed 100
D. mac-limit maximum 1
【单选题】
QUESTION 5 如下图所示网络,SWA的MAC地址表如下,交换机始终学习不到HOSTA的MAC地址,不可能是以下哪种原因?___
A. HOST A没有发送任何数据帧
B. 交换机的G0/0/1端口被设置为ACCESS模式
C. 交换机的G0/0/1端口关闭了MAC地址学习功能
D. 关闭HOST A所属LAN的MAC地址学习功能
【单选题】
QUESTION 6 网络管理员发现交换机的某个端口已经学习到MAC地址,但是却不能转发数据帧,此端口处于以下哪种工 作状态?___
A. Disabled
B. Blocking
C. Listening
D. Learning
【单选题】
QUESTION 13 参考以下拓扑及配置,路由器R1与R2通过Serial低速线缆连接,且数据链路层封装使用PPP。当R1和R2的 Holdtime不一致时,PPP协商失败,无法通信。___
A. 对
B. 错
【单选题】
QUESTION 22 下面关于IP报文头部中TTL字段的说法正确的是()。___
A. IP报文每经过一台路由器时,其TTL值会被减1
B. IP报文每经过一台路由器时,其TTL值会被加1
C. TTL定义了源主机可以发送数据包的时间间隔
D. TTL定义了源主机可以发送数据包的数量
【单选题】
QUESTION 24 VRP操作平台对于输入命令不完整使用下列哪条信息提示?___
A. Error:Wrong parameter found at ‘^' position
B. Error:Incomplete command found at '^'position
C. Error:Too many parameters found at '^' position
D.
E. rror:Ambiguous command found at ‘^'position
【单选题】
QUESTION 25下面关于生成树指定端口的描述正确的是()。___
A. 根交换机上的端口一定不是指定端口
B. 指定端口可以向与其相连的网段转发配置BPDU报文
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D. 指定端口转发从此交换机到达根交换机的配置BPDU报文
【单选题】
QUESTION 30 管理员通过Telnet成功登录路由器后,发现无法配置路由器的接口IP地址。那么可能的原因有()。___
A. SNMP参数配置错误
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【单选题】
QUESTION 34 PPP协议LCP协商阶段,如果完全接受对方发送的参数,则发送以下哪个据文?___
A. Configure-Reject
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【单选题】
QUESTION 36 Router C的输出信息如下,则Router C发送OSPFv3 LSU报文时的源IPv6地址为?___
A. 2003::1/64
B. FE80::2E0:FCFF:FE48:4EC8
C. 2005::1/64
D. 2009::1/64
【单选题】
QUESTION 38 FEC(Forwarding Equivalence Class)转发等价类,是一组具有某些共性的数据流的集合;FEC可以根据地址进行划分,但是不能根据业务类型、QoS等要素进行划分。 ___
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【单选题】
QUESTION 39 关于OSI参考模型中网络层的功能说法正确的是? ___
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