万历时王世懋在《二酉委谭摘录》中说：“天下窑器所聚，其民繁富，甲于一省”“万杵之声殷地，火光烛天，夜令人不能寝”，因而他戏称景德镇为“四时雷电镇”。材料反映（）。 ["A.已出现专业化市镇 ","B.产生资本主义生产关系萌芽 ","C.产品精美 ","D.产品种类繁多"]
When troubleshooting the issue， you notice the election of a new root bridge with an unknown MAC address. Knowing that all access ports have the PortFast feature enabled， what would be the easiest way to resolve the issue without losing redundant links？（） ["Enable bpduguard globally.","Enable rootguard.","Enable loopguard.","Enable spanning tree.","Enable UDLD"]
何为地震子波。
班主任的工作是一种（）。 ["教育工作","专门性的工作","教师的兼职工作","思想教育工作"]
觉察
“三致”作用
