Saturday, September 17, 2022
问题:黑白电视机超高频调谐器的混频电路,常采用二极管混频,它的优点是(...
Friday, September 16, 2022
问题:电油汀的电源线路损坏断路,可引起()故障。A、通电后加热灯亮但不加热B、通电后加热灯不亮也不加热C、加热温度过低D、加热温度过高...
Wednesday, October 26, 2022
Friday, September 16, 2022
问题:电磁炉的CPU蜂鸣器驱动引脚无电压输出,会引起()的故障。...
Friday, September 16, 2022
问题:松下多制式大屏幕彩电,彩用了固定中频的作法,固定中频的频率是()A、44.1MHzB、38MHzC、35、MHzD、38MHz...
Tuesday, October 17, 2023
Friday, September 16, 2022
Sunday, September 11, 2022
Friday, September 16, 2022
问题:VHS录像机采用旋转磁头鼓后,其上限记录频率可以达到()A、15KHZB、2.5MHZC、4.5MHZD、8MHZ...
Saturday, April 6, 2024
问题:普及型调频收音机输入回路宽带方式谐振电容为()电容A、固定B、双连C、微调D、可变...
Friday, February 23, 2024
问题:电热水器的部分发热元件损坏,可引起()的故障。A、接通电源全无B、出水温度低C、不出水D、出水不畅通...
Wednesday, September 28, 2022
问题:录像机的键控输入电路常采用两种形式,即梯形电阻形式和矩阵形式...
Sunday, March 3, 2024
问题:()触发电路输出尖脉冲A、交流变频B、脉冲变压器C、集成D、单结晶体管...
Saturday, March 11, 2023
问题:CCD具有光电转换特性。CCD在光的照射下,能够产生自由电子,而...
Sunday, September 11, 2022
Friday, September 16, 2022
Friday, September 16, 2022
问题:家用DV格式的数字摄录一体机一般采用()宽的金属磁带。...
Saturday, September 17, 2022
问题:彩色电视机的中频电路对中频信号进行放大、检波、混频后将输出()...
Friday, September 16, 2022
Friday, September 16, 2022