BBS是指（） ["聊天室","网上公告栏","网盘","网上平台"]
Before installing a new, upgraded version of the IOS, what should be checked on the router, and which command should be used to gather this information?（） [" the amount of available ROM"," the amount of available flash and RAM memory"," the version of the bootstrap software present on the router"," show version"," show processes"," show running-config"]
好氧堆肥法
对于形成杂质缺陷而言，高价正离子占据低价正离子位置时，该位置带有正电荷，为了保持电中性，会产生（）。 ["正离子空位","间隙负离子","负离子空位","A或B"]
what’s the role of community attribute in the bgp route？
教会的特征是什么？
