directionally drilled crossing
... directionality 方向性 directionally drilled crossing 定向钻孔穿越 directionless antenna 无方向性的天线 ...
基于64个网页-相关网页
·2,447,543篇论文数据，部分数据来源于NoteExpress
水平定向钻孔(HDD)常常是管道穿越河流或湿地这类障碍优先选用的方法。插图表示河流穿越的典型情况。
HDD is often the preferred method for constructing the pipeline across such obstacles as streams or wetlands. (See inset diagram.) Here is shown a typical river crossing.
youdao
应用推荐
模块上移
模块下移
不移动