You are configuring an 802.1Q trunk between a Layer 2 switch and a firewall. You read in the documentation that the best way to set up a trunk is to set the port as dynamic desirable. The trunk is not coming up. Which one of these options would be a valid explanation？（） ["The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode ON","The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode to OFF","The firewall does not support Cisco Discovery Protocol. You should set the switchport trunk mode as auto","The firewall does not support DTP.You should set the switchport trunk mode to ON"]
汽车对道理静力作用的大小与（）无关 ["车轮总重","轮胎内压力","作用次数","轮胎性质"]
各级管理人员对铁路局问题管理督办平台反馈的问题因作风漂浮、作用不强造成督办问题产生不良影响和后果，管理人员（）。 ["红线","通报批评","失格","降档"]
刮板输送机的机头轴的作用是通过轴上装有的链轮驱动（）运转。 ["液力连轴器","刮板链","紧链器","减速器"]
谈谈教育政策的内涵。
如何实现给水全程自动调节？
