题型:选择题 The crowd cheered wildly at the sight of Liu Xiang, who was reported the world record in the 110-metre hurdle race.[ ]A. breaking B. having broken C. to have broken D. break 查看答案
题型:单项选择题 窄带 ISDN 提供的“一线通”业务将 B 信道和 D 信道合并为一个数字信道使用,其 速率为______。A.512kbps B.144kbps C.128kbps D.64kbps 查看答案