《矿山安全法》规定, 每个矿井必须有至少几个以上能行人的安全出口？
对于粉尘作业点，矿山企业应当按照国家规定的方法，每月至少检测（） ["一次","二次","三次","四次"]
An SVI has been configured on a device. Which two statements are true about a switched virtualinterface （SVI）？（） ["An SVI is normally created for the default VLAN （VLAN1） to permit remote switchadministration","Multiple SVIs can be associated with a VLAN","SVI is another name for a routed port","An SVI is created by entering the no switchport command in interface configuration mode","An SVI provides a default gateway for a VLAN"]
常用的保藏方法
下列（）交换机功能。 ["减少数据发送冲突的发生，避免拥挤，提高网络带宽","放大信号","数据链路层控制","路由选择"]
亲属法
