模拟微波质量标准,终端话路在零相对电平点容许噪声功率不大于-50dBm,即()PW。A、5000B、1000C、10000...
Sunday, March 31, 2024
Tuesday, September 13, 2022
数字通信中单极性不归零的符号是(),高密度双极性码(连零抑制码)符号为()。...
Wednesday, March 13, 2024
和电力线载波机连接时音终盘应用()A、主站音终B、普通音终盘C、付站音终...
Thursday, January 19, 2023
Tuesday, July 4, 2023
Friday, September 16, 2022
数字微波中继方式中的基带中继相当于模拟微波的中频转接方式...
Friday, September 16, 2022
限幅器是一种由()元件所组成的电路。A、线性B、非线性C、任意...
Wednesday, March 20, 2024
电源中的电流是从负极流向正极,而负载是的电流总是从电位高处的一端...
Tuesday, September 13, 2022
抽样的任务是每隔一定时间,对模拟信号抽样一次,抽样后的信号即为数字信号。...
Saturday, May 11, 2024
输入谐振腔的原理是一段长度为γ/4的终端短路同轴线,相当于一个(...
Friday, September 16, 2022
Tuesday, September 13, 2022
已开通微波电路的频段,方位和使用范围不准()如需更改,应按规定()...
Sunday, March 31, 2024
Friday, September 16, 2022
Tuesday, November 28, 2023
共射极放大器带负载RL后,交流负载RL’值()A、增大B、减小C、不变...
Sunday, March 31, 2024
Friday, August 11, 2023
及时消除电路和设备故障,保持电路畅通和安全运行是()主要任务。A、通信站B、通信调度C、地区局,厂的通信机构...
Saturday, May 11, 2024
要使NPN晶体管放大器正常工作,必须是发射结和集电结都加正向偏压...
Friday, September 16, 2022
Friday, September 16, 2022