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  • He told us that he _____ soon.
  • Tom's parents are worried about him because they haven't _____ letters from him for a long time.
  • 测得三极管ib=30μA时ic=2.4mA,而ib=40μA时ic=3mA,则该管的交流电流放大系数β为( )
  • 某三极管放大器的电压放大倍数为1000,电流放大倍数为100,那么它的功率增益为( )dB。
  • 当放大电路中引入电流并联负反馈以后,其输入电阻将( )
  • 集成运放常见的故障是
  • 在放大电压信号时,通常希望放大电路的输入电阻和输出电阻为( )
  • 只有在电路中的( )确定之后,电流才有正负之分。
  • 标称值为1MΩ,允许误差为±2%的五色环电阻的色环顺序为( )
  • — Is there _____ in today’s newpaper?—No, noting.
  • _____ Alice _____ I have the book.We are going to buy it this afternoon.
  • 正常人尿比重约为( )。
  • 导尿前需要彻底清洁外阴的目的是( )。
  • You can ask a trusted friend for_____
  • He began to learn Russian at the age of _____ .At the end of six months he had learnedenough to read articles and reports in Russian.
  • _____ 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?