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  • 用电流表、电压表测量电路中某一元件的电流、电压时,某同学将交流电的频率调的比较低,只有0.5Hz时,发现两个电表的指针偏转不一致,于是他用相机记录下了某一时刻的指针偏转情况,通过分析可以得出该元件为
  • 共集电极电路的应用不正确的是。( )
  • 当负反馈深度较大时,放大电路的闭环放大倍数几乎只决定于( )
  • 对集成运算放大电路组成部分描述正确的是
  • The bad _____ what one wishes to stay away from.
  • Teenagers should neither smoke _____ drink.
  • My friend's birthday is coming, so I send a pen _____ as birthday gift.
  • When someone hurts you, _____ yourself down first.
  • Missing the train _____ waiting for another hour.
  • Your compositions _____ in after class.
  • — _____ I hand in the report today? — No, you needn't.
  • 自花传粉现象在自然界得以保存的原因是( )。
  • 由理想运算放大器的特性得出“虚短“和“虚断”两条推论,它们的具体含义是
  • 放大电路在高频信号作用下放大倍数下降的原因( )
  • 理想电流源与内阻( )且阻值( ),理想电压源与内阻( )且阻值( )
  • 某电解电容器上标有“25V、470μf”的字样,对此,下述说法中正确的是( )
  • It’s _____ that I’d like to go on a picnic.
  • In this part of the country,____summer begins in June.
  • The bus stops right _____ our house.
  • _____ of the students in our class_____ money to the disabled people these days.