问题:为了在示波器荧光屏上得到清晰而稳定的波形,应保证信号的扫描电压同...
Monday, September 12, 2022
问题:正弦交流电路中,理想电感元件感抗X<sub>L</sub>=4Ω...
Monday, September 12, 2022
问题:参数固态继电器可以()和各种敏感元件构成自动控制系统。...
Thursday, September 15, 2022
Monday, December 25, 2023
问题:误差按出现的规律可分为系统误差、随机误差、疏忽误差。...
Thursday, March 23, 2023
问题:三相有功功率测量有三表法和两表法两种,请指出分别适应于那两种电路...
Thursday, September 15, 2022
问题:将TTL电路的电源与地端分别接在+5V电源的负极上,把输入端之一...
Thursday, September 15, 2022
问题:当示波器的扫描速度为20s/cm时,荧光屏上正好完整显示一个的正...
Thursday, September 15, 2022
Thursday, February 8, 2024
Thursday, September 15, 2022
问题:示波器的信号输入有交流和直流两种方式,它们的区别是:()。...
Thursday, September 15, 2022
Monday, September 12, 2022
Monday, December 25, 2023
问题:在防爆区域,电缆沿工艺管线敷设时,当工艺截止的密度大于空气时,电...
Monday, September 12, 2022
问题:通径相同的单座阀a、双座阀b和偏芯旋转阀c的流通能力()...
Thursday, September 15, 2022
问题:自动控制系统中,扰动量是指破坏平衡状态,引起被控量变化的()因素。A、内部B、调节器故障C、外部D、测量误差...
Saturday, September 30, 2023
Saturday, September 30, 2023
Monday, September 12, 2022
Saturday, February 11, 2023
Saturday, September 30, 2023