Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?（） ["It has more than one interface that is connected to the root network segment.","It is running RSTP while the elected root bridge is running 802.1d spanning tree.","It has a higher MAC address than the elected root bridge.","It has a higher bridge ID than the elected root bridge."]
生产物流
在其它条件一定时，通过料层的风量越大则烧结速度越（）。 ["快","慢","无影响"]
建设监理单位的特性包括（） ["科学性","独立性","强制性","公正性","服务性"]
烧结料层的（）是由抽风机运转作用形成的。 ["厚度","水分","真空度"]
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