问题:Ⅰ类计量装置配用的有功电能表准确级是()。A、0.2级;B、0.5级;C、1.0级;D、2.0级。...
Friday, November 15, 2024
Friday, January 5, 2024
问题:在晶体管电路中,为了利用RC相移网络倒180°,至少要用()RC相移网络。A、一节;B、二节;C、三节;D、四节。...
Wednesday, April 3, 2024
问题:计算题:某人设计一个单相全波整流电路,要求输出电压UL为120V,IL电流为3A,试求整流变压器每个二次绕组的电压。...
Wednesday, April 3, 2024
问题:计算题:现场工作人员检测到三相有功电能表1min发出了30个脉冲...
Friday, September 16, 2022
问题:产权属电力企业的负荷控制装置在运行过程中,因值班电工操作不当造成...
Tuesday, September 13, 2022
问题:按覆盖的地理范围进行分类,计算机网络可以分为三类()。A、局域网、广域网与x.25网;B、局域网、广域网与宽带网;C、局域网、广域网与ATM网;D、局域网、广域网与城域网。...
Saturday, November 30, 2024
Sunday, February 26, 2023
问题:多功能电能表除了RS-485接口外,还必备有()。A、RS-232接口;B、USB接口;C、红外接口;D、RS-422接H。...
Wednesday, November 22, 2023
Tuesday, March 4, 2025
问题:并联谐振又称为()谐振。A、电阻;B、电流;C、电压;D、电抗。...
Friday, July 19, 2024
Tuesday, September 13, 2022
Monday, March 25, 2024
问题:低压空气断路器在跳闸时,是消弧触头先断开,主触头后断开。()...
Wednesday, July 31, 2024
Friday, November 15, 2024
问题:耦合电容器与结合滤波器相连处应装设()。A、熔断器;B、单极隔离开关;C、断路器;D、接地开关。...
Friday, September 27, 2024
Tuesday, September 13, 2022
问题:用电压表测得的交流电压是()。A、最大值;B、有效值;C、平均值;D、瞬时值。...
Wednesday, November 22, 2023
问题:三相四线制供电系统中,零线电位的高低完全决定于零线中流过电流的大小。()...
Sunday, May 4, 2025
Friday, September 16, 2022