题型:填空题 Letter boxes are much more in the UK than in the USA, where most people have a mailbox instead. [ ]A. common B. normal C. ordinary D. usual 查看答案
题型:填空题 网络中发生了拥塞,其判断依据是()。A.随着通信子网的负载增加,吞吐量也增加B.网络节点接收和发送的分组数量越来越少C.网络节点接收和发送的分组数量越来越多D.随着通信子网的负载增加,吞吐量反而降低 查看答案