热镀锌人防密闭接线盒用在防护密闭门或临时战争封堵外侧受冲击波方向，接线盒应采用防护盖板。
Hot dip galvanizing air sealed junction box used in a protective airtight door or temporary plugging outside of war by shock wave direction, junction box should be used in protective cover.
桥梁的内外侧轮廓线应顺滑清晰，无突变、明显折变或反复现象。
The contour line of the inner and outer of bridge shall be smooth and clear, without sudden break, obvious flection or recurrence.
留设保护煤柱时，底板岩巷应位于集中应力区的外侧或跨采时工作面应推过足够距离，使巷道靠近采空区应力恢复区的下方。
The floor roadway should be located out of the abutment stress zone when protection coal pillar is retained, or the working face should be pushed away for enough distance under overhead mining.
应用推荐