进膛痕迹、线膛痕迹、坡膛痕迹、拔弹痕迹是弹头经枪械运动循环后，在弹头上形成的四种主要的弹头痕迹。
Chamber-loading trace, rifling trace, chamber throat trace and bullet pulling brace are the four major bullet traces which formed on the bullet after its movement circulation.
利用钻机综合检测实验台测试成品钻机的输出最大给进力和起拔力来检验理论计算结果的正确性。
Making use of the rig general detecting laboratory to test the deferent maximal feeding force and drawing back force of drill rig, the validity of theoretic accounting value are analyzed in the paper.
自然通风从四周外墙处进风，然后将污浊的室内空气利用楼梯间角楼的烟囱效应向外拔风。
Natural ventilation enters the wind from all around the outer wall place, then in the filthy room the air outward will pull out the wind using the stair hall watchtower chimney effect.
自然通风从四周外墙处进风，然后将污浊的室内空气利用楼梯间角楼的烟囱效应向外拔风。
Natural ventilation enters the wind from all around the outer wall place, then in the filthy room the air outward will pull out the wind using the stair hall watchtower chimney effect.
应用推荐