用于描述邻近小区BCCH频点的系统消息类型是() ["3","4","5","6","7"]
用于位置区识别的系统消息类型是() ["2","2bis","4","5","5bis"]
IS-IS固定报文头的第一个字节是初始协议标识符,字段值为()。 ["0x80","0x81","0x82","0x83"]
用于小区识别的系统消息类型是() ["1","2","2bis","2ter","3"]
城市轨道交通设备基本上可分为()等构成。 ["供电系统","车站系统运营设备","车辆和牵引供电","线路和站场","通信和信号"]
使用25—28mm的原棉纺普梳纱时,采用倒欠伸好还是顺欠伸好?