以下各项命令中能够绘制出“点”类对象的命令有（）。

[判断题]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

[单选题]______我来说，能考上重点大学是我的最大心愿。

[单选题]一台换热器未设折流板和支持板，其管板间距为L，则换热管受压失稳的当量长度Lcr 为 （） 。

[单选题]颌面部间隙感染最常见的病原菌是（）

[判断题]房屋建筑施工面积是指在报告期内施工的全部房屋建筑面积。

[单选题]燃气计量表必须经过（）检定机构的检定，检定日期应在有效期限内。

[单选题]尿道膜部损伤时，尿生殖膈没损伤时，尿外渗至（）

[单选题]项目沟通有四个需求，其中不包括：（）

[单选题]根据《公务员法》，下列说法正确的是（　　）。

[多选题]肺性脑病发生机制主要是（）