Friday, September 16, 2022
Saturday, September 17, 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
问题:摄录一体机中摄像部分是将分离的亮度和色度信号分别输入录像部分,省去了再分离过程,因而可以得到较高的()。A、对比度B、灵敏度C、信噪比D、清晰度...
Wednesday, March 13, 2024
问题:电烤箱是一种利用()所发出的热辐射,对食品()的进行烘烤的电热炊...
Sunday, September 11, 2022
问题:彩色电视机带通放大器如图所示,当ACC检波输入的7.8千赫正弦信...
Friday, September 16, 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
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:串联谐振电路中,偏离谐振频率较大时,其等效阻抗变为()A、0B、最大C、最小D、不定...
Thursday, October 27, 2022
Sunday, March 3, 2024
问题:家用录像机中在信号处理过程中,采用了()方法来缩视频信号的倍频程...
Friday, September 16, 2022
Friday, September 16, 2022
Friday, September 16, 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: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
Sunday, September 11, 2022
问题:B.东芝大屏幕彩电,通过I2C总线控制整机的许多工作状态是通过传...
Friday, September 16, 2022