The convector pits are covered with convrete grids that are prefabricated for building pigsties.
供热器并被通常用在猪圈上的混凝土格栅覆盖。
板;The convector pits are covered with convrete grids that are prefabricated for building pigsties.
供热器并被通常用在猪圈上的混凝土格栅覆盖。
Model testing study is made on prefabricated spiral V-notch blasting, and hydromatic method is used to simulate the quasi-static process in blasting of explosive.
因此，研究螺旋切槽裂纹的扩展以及与螺旋角等的关系，具有重要意义。
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