In an Ethernet network, under what two scenarios can devices transmit?（） [" when they receive a special token"," when there is a carrier"," when they detect no other devices are sending"," when the medium is idle"," when the server grants acce"]
因承运人责任使旅客不能按票面记载的日期、车次、座别、铺别乘车时，站、车（）。 ["不予办理","应重新妥善安排。","退票"]
在加计数器的设置输入S端的（），将PV端指定的预置值送入计数器值。 ["高电平","低电平","上升沿","下降沿"]
载荷中心距
解决路由环问题的方法有（） [" 水平分割"," 路由保持法"," 路由器重启"," 定义路由权的最大值"]
融合课程
