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  • 决定渐开线齿廓形状的齿轮基本参数是( )。
  • 梯形螺纹与锯齿形、矩形螺纹相比较,具有的优点是( )。
  • 工作在放大区的某三极管,当ib从10微安增加到40微安,ic从1mA增加到4mA,则β为( )。
  • 为了使高阻输出的放大电路与低阻负载很好地配合,可以在放大电路与负载之间插入。( )
  • I together with my clssmates _____ going to visit the museum tomorrow.
  • Both Shanghai _____ Beijing have traffic jams in rush hours.
  • There are some apples in the desk, aren't _____ ?
  • His father hardly knows English, _____ ?
  • To our _____ , the headmaster was very _____ with our report.
  • — Do you hve any plans for the coming vacation? — Sure. We decide _____ Sanya in February.
  • — Mr Li, _____ we play basketball this afternoon? — Sure, but you _____ finish your exercises first.
  • 65V带传动在水平安装时,为( )经常将松边置上方。
  • 螺栓联接的主要特点是( )。
  • 在三极管构成的三种基本放大电路中,电流放大倍数等于1的是( )。
  • 在常用放大电路中,应用最广的电路是( )电路
  • Half bottle of the milk was drunk and the rest _____ bad the next day.
  • The little girl didn't stop crying _____ her mom came back.
  • There _____ a car accident yesterday which caused 4 people to death.
  • — Help! There is a snake near my bike. — _____ afraid. I will help you send it away.
  • Reading can _____ your life.