下列哪些接口可作逻辑通道______
A.X.25 B.帧中继 C.dialer D.同/异步串口
参考答案:A,B
________ got on the train when it began to move.
A.No sooner had I
B.I had no sooner
C.Hardly had I
D.I hardly had
各级人民政府文化行政主管部门、公安机关及其工作人员不得举办娱乐场所。( )