A client is searching for an access point （AP）. What is the correct process order that the client and access point go through to create a connection？（） ["probe request\/response， authentication request\/response， association request\/response","association request\/response， authentication request\/response， probe request\/response","probe request\/response， association request\/response， authentication request\/response","association request\/response， probe request\/response， authentication request\/response"]
重组合作用？
发展中国家应该怎样缩短同发达国家的知识差距？
指出下列句中的古今字并说明意义澭水暴益，荆人弗知，循表而夜涉，溺死者千有余人，军惊而坏都舍。
船闸的工作原理
声母
