初至波
基于1个网页-相关网页
preliminary wave positioning 二次定位
·2,447,543篇论文数据，部分数据来源于NoteExpress
Through the seismic wave exploration by us in A2 and A3 working faces, the conditions, velocity, frequency and penetrating distance of seismic wave in the main mining seams are understood preliminary.
通过在A 2、A 3两个面的槽波探测工作，初步了解了其主采煤层的槽波条件、波速、频率和槽波穿透距离。
youdao
应用推荐
模块上移
模块下移
不移动