【简答题】用两个相同型号的硅稳压管组成如图1.5.8所示的稳压电路,已知稳压管的稳压值为5.3V,正常工作电流范围为1 mA一10mA,负载电阻RL的变化范围为3kΩ~4kΩ。试确定限流电阻尺的标称取值范围,并分析两个稳压管反向串接的理由。
【单选题】车辆行驶时,动力系统故障突然点亮,车速逐渐降低,10秒钟以后,整车停止运行,可能原因是
【单选题】由稳压管组成的稳压电路如图所示,已知Vi=18V,稳压管DZ1的稳压值为7V,稳压管DZ2的稳压值为6V,稳压管具有理想特性,则输出Vo为()【图片】
【单选题】Which of the following statements is true?
A.
Christmas is the season for common people to earn money.
B.
Most Chinese people think they have something to do with Christmas.
C.
Christmas is the season people will hold their hard-earned money tightly.
D.
Few Chinese people feel they are connected with the Christmas celebration.
【单选题】车辆行驶时,动力系统故障突然点亮,车速逐渐降低,10秒钟以后,整车停止运行,可能原因是
【单选题】弧焊变压器的输入电压是单相;直流弧焊机的输入电压是 相。
【简答题】In America and around the world, Christmas offers many opportunities to spread 'peace on earth, good will toward men'. For example, Salvation Army bell ringers are a familiar sight to most Christmas s...
【判断题】17 用过的吸管和滴管的清洗。需在酪酸洗涤液中浸泡2h以上,取出在流水中冲洗半小时,再用蒸馏水冲淋1次。
【单选题】车辆行驶时,动力系统故障突然点亮,车速逐渐障低,10秒钟以后,整车停止运行可能原因是