null line中文什么意思

例句与用法

1. When the redirected stream is closed , a null line is sent to the event handler
   当关闭重定向流时，会向事件处理程序发送一个空行。
2. By pressiong the 2 buttons , check the side by side lines one by one . if the light is on , it is phase line , otherwise it is the null line , in case there is a break in the line , move until hte light is off . that is the break point
   按两键)以铺好的三芯或四芯电缆或电线，可将另一端全部良好接地，再如图分别检测灯亮则通，此法适合楼房装修布线，将主线接地，边安装边测试。
3. This thesis not only analysed the serious results of deviation of electricd pressure , which was harm for equipments and personal safety , caused by disconnection of null line , but also proposed effective protecting measure for mulfunction , such as repetition earth protecting measures and so on
   摘要分析了零线断线造成电压偏移而对设备和人身安全带来的严重后果，提出了重复接地等有效的故障保护措施。