“一带一路“中”一带“的沿线省市有（） ["甘肃","河南","新疆","山东"]
《教育法》中规定，学生有（），尊敬师长，（）的义务。
扩音机与扬声器之间的连接有几种方式？
You are the Cisco Network Designer in Cisco.com. Which two statements about Layer 3 access designs are correct?（） [" Convergence time is fractionally slower than STP."," Broadcast and fault domains are increased."," IP address space is difficult to manage."," Fast uplink convergence is supported for failover and fallback."]
砂矿床的分类
简述酶固定化技术的几种主要方法，并比较其优缺点。
