pervious seam的意思|示意

美 / ˈpɜ:vi:əs si:m / 英 / ˈpəviəs sim /

松接缝，漏水缝

pervious seam相关例句

We are puzzled by the pervious to water, the underground coal seam fire prevention, the question of deep zone mining and coal mining from incidence in Jixi.

透水、地下煤层防灭火、深部开采问题、大倾角采煤已经成为困扰鸡西煤炭开采的技术问题。