单选题
一般来说，成形车刀的重磨沿（）进行，且保持设计时的（）
发布日期：2020-12-11
前刀面，前角
后刀面，后角
前刀面，前角和后角
后刀面，前角和后角
试题解析
成形车刀
成形车刀是加工回转体成形表面的专用工具，它的切削刃形状是根据工件的轮廓设计的。
- 中文名
- 成形车刀
- 应用对象
- 回转体
- 用途
- 工业
计时
我们每天都要通过钟表来掌握时间，合理安排一天的学习与生活。在一些比赛项目中，也常是通过计时来决定每个人的成绩。现如今的计时也有按照劳动时间多少技术熟练程度来计算的意思。
- 中文名
- 计时
- 外文名
- time
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Spanning-Tree Protocol is a link management protocol that provides path redundancy while preventing undesirable loops in the network. For an Ethernet network to function properly， only one active path can exist between two stations. Multiple active paths between stations cause loops in the network. If a loop exists in the network topology， the potential exists for duplication of messages. When loops occur， some switches see stations appear on both sides of the switch. This condition confuses the forwarding algorithm and allows duplicate frames to be forwarded. To provide path redundancy， Spanning-Tree Protocol defines a tree that spans all switches in an extended network. Spanning-Tree Protocol forces certain redundant data paths into a standby （blocked） state. If one network segment in the Spanning-Tree Protocol becomes unreachable， or if Spanning-Tree Protocol costs change， the spanning-tree algorithm reconfigures the spanning-tree topology and reestablishes the link by activating the standby path. Spanning-Tree Protocol operation is transparent to end stations， which are unaware whether they are connected to a single LAN segment or a switched LAN of multiple segments.There is a lab about STP in Cisco CCNP 642-812 / 642- 892 exam. Requirements: You will configure FastEthernet ports 0/12 through 0/24 for users who belong to VLAN 20. Also, all VLAN and VTP configurations are to be completed in global configuration mode as VLAN database mode is being deprecated by Cisco. You are required to accomplish the following tasks: 1. Ensure the switch does not participate in VTP but forwards VTP advertisements received on trunk ports. 2. Ensure all non-trunking interfaces (Fa0/1 to Fa0/24) transition immediately to the forwarding state of Spanning-Tree. 3. Ensure all FastEthernet interfaces are in a permanent non-trunking mode. 4. Place FastEthernet interfaces 0/12 through 0/24 in VLAN 20
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