神枪是以前论坛团购的一个好东西。作者: garysu 时间: 2013-10-2 13:48
搭车问问,神枪的两个喷嘴有什么区别?作者: ccrrff 时间: 2013-10-2 13:51
Actually it is a standard excavation procedure called jet-vaccum digging in civil industry.
In such locations where utilities are close to each other, the crew will use high pressure jet to expose the pipe and suck out mud using the vacum tube from the combo truck.