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  • 右手螺旋定则是判断( )方向
  • 动力供电线路中,采用星形联结三相四线制供电,交流电频率为50Hz,线电压为380V,则( )
  • 患者,女性,30岁,痔复发需坐浴治疗。欲消毒坐浴盆,最简单、有效的方法是( )。
  • 下列属于迁飞性害虫的是
  • 单体雄蕊是
  • 一般植物生长速率的表现为
  • 植物缺硼时,其缺素状首先出现在
  • 对农业生产有指标和临界意义的温度称为
  • 下列不属于清洁能源的是
  • 带有放大环节的串联型稳压电路中的放大环节不可以是( )
  • The doctor worked _____ five hours _____ a rest.
  • 执行下面的程序,其结果是_________。
    int main( void )
    {
    int i,sum=0;
    for(i=1; i<=3; sum++)
    sum += i;
    printf(""%d\n"", sum);
    return 0;
    }
  • _______ late for class next time.
  • 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?