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  • 稳压二极管的正常工作状态是( )。
  • 直流放大器克服零点源移的措施是采用( )。
  • 并联型开关稳压电路中,储能电感与负载( )。
  • 关于N型半导体的下列说法,错误的是( )。
  • 将PN结P区接电源负极,N区接电源正极,此时PN结处于( )偏置。
  • C语言允许函数值类型缺省定义,此时该函数值隐含的类型是( )。
  • 标准圆锥销具有的( )锥度。
  • 分度头的两种常用分度方法是( )和( )。①简单分度法②近似分度法③角度分度法④差动分度法正确答案是( )
  • 如图所示,左视图正确的是( )
  • 已知主、俯视图,选择正确的作剖视的左视图( )
  • 已知主、左视图,选择正确的俯视图( )
  • 以下程序中循环体的执行次数是_________。
    int main(void)
    {
    int i,j;
    for(i=0,j=1;i<=j+1;i+=2,j--)
    printf("%d\n", i);
    return 0;
    }
  • —What's up? You look so puzzled.
    —I remember ______ the door. But I don't know why it's open now.
  • Jenny, you____play with the knife. You may hurt yourself.
  • — Whose handwriting is beside _____? — I'm not sure. Maybe it is _____ .
  • Yesterday was _____. We sent some beautiful flowers to our teachers.
  • ______ you saw in the hospital were doctors.
  • Father doesn't tell me when he _____ I'll telephone you as soonas he _____.
  • The pretty museum _____ several years ago.
  • — Would you like to come to dinner tonight? — I'd like to, _____ I am too busy.