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  • 以下对改善土壤氧气供应状况无效的有( )。
  • 计算内力一般( )方法。
  • 若变量已正确定义且k的值是4,计算表达式(j=4,k--)后,j和k的值为( )。
  • The English novel is quite easy for you. There are ______ new words in it.
  • Lesson One is very difficult. There_____ many new words in it.
  • — Have you finished your homework, Jimmy? — Yes,I _____ it an hour ago.
  • 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.
  • Do you know if _____ strange happened to Miss Tang yesterday?
  • 观察发现小麦的叶鞘为红紫色,估计是缺乏( )。
  • 下列程序段的输出结果是_________。
    int a=15,b=21, m=0;
    switch( a%3 ) {
    case 0: m++; break;
    case 1: m++;
    switch( b%2 ) {
    default: m++;
    case 0: m++; break;
    }
    }
    printf(""%d\n"",m);
  • 在C语言中,if语句嵌套时,if与else的配对关系是( )。
  • The teacher raised her _______ to make herself heard clearly.