【简答题】● For (71) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (72) for every packet sent. Instead, when a connect...
【单选题】Historians can't tell us when, where or 【71】 the first food was cooked. In earliest 【72】 when people had eaten their food 【73】 , an fire was used only to provide heat and light. The first primitive co...