Saturday, September 17, 2022
问题:光信号传输是以光波为载频,以光导纤维为介质的l种通信方式。...
Tuesday, March 21, 2023
Saturday, September 17, 2022
Saturday, September 17, 2022
Friday, September 16, 2022
问题:()承担着判定障碍具体部位,并与机线人员配合修复障碍的工作。...
Saturday, September 17, 2022
Sunday, November 12, 2023
问题:放大器放大的实质是输入信号控制下,把()输出。A、输人电压转化为信号电压B、输人电流转化为信号电流C、电源功率转化为信号功率D、输大功率转化为信号功率...
Sunday, September 3, 2023
问题:EPON网络是由局侧的光线路终端()、用户侧的光网络单元()和光...
Saturday, September 17, 2022
Saturday, September 17, 2022
Saturday, September 17, 2022
问题:程控数字交换机和纵横交换机比较,节省()有色金属。...
Saturday, September 17, 2022
问题:通信企业的项目管理中有3个重要的目标,其中不包括()。...
Saturday, September 17, 2022
问题:过压保护采用()二极放电管,对雷击强电感应的瞬时脉冲,放电管过压保护,并具有自复功能。A、普通B、陶瓷C、发光D、热敏...
Friday, December 23, 2022
问题:总配线架是交换机与外线转接设备,同时也保护局内设备。...
Saturday, September 17, 2022
Saturday, September 17, 2022
问题:在WORD编辑时,文本的对齐方式有()。A、分散对齐B、反向对齐C、居中对齐D、左、右对齐...
Thursday, January 11, 2024
Friday, September 16, 2022
问题:施密特电路是一种()藕合的双稳态电路。A、射极B、集一基C、集一射D、基一射...
Sunday, January 14, 2024
Friday, September 16, 2022