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  • 某电容器两端的电压为40V,它所带的电量是0.2C,若电容器两端的电压降到20V时,则( )
  • 花生叶是复叶
  • 在电路中引入电流串联负反馈后,与基本放大器的输入、输出电阻相比,加反馈后放大器的输入、输出电阻的变化是( )
  • 一个三级放大器,各级放大电路的输出阻抗分别是Ro1=100kΩ,Ro2=200kΩ,Ro3=300kΩ,则此多级放大电路的输出阻抗为(  )
  • 测量三相异步电动机电流大小用( )
  • He has made _____ progress this term than before.
  • The girls asked _____ they took enough food and drink with them.
  • Does Mike often play _____ table tennis after _____ school?
  • The chair was broken, so he had to fix it up _____ a hammer.
  • — Could you lend me an exercise book? — Of course. Here are two and you can take _____ of them.
  • He left words with my father that he would come to support me in the convention and he kept his _____ .
  • 膀胱炎患者排出的新鲜尿液有( )。
  • 多尿是指24小时尿量超过( )。
  • 为右上肢骨折病人脱、穿衣服的正确方法是( )。
  • 长度为16cm的无菌持物镊,消毒液应该浸泡的长度至少为( )。
  • _____ you don't lose heart, you will find a way to overcome the difficulty.
  • _____ and then you will make greater progress.
  • Look at the picture. The top five TV plays _____ in it.
  • It is raining heavily outside and you ____ out now.
  • Is _____ necessary to tell her mother everything?