The screw joint of the reducer bonnet and body was concluded as the failure position because of its small contactheight.
经分析得出:事故原因是减压阀阀座和阀盖的连接螺纹接触高度过小,强度不足,导致螺纹连接失效。
2
An air burst is an explosion in which a weapon is detonated in air at an altitude below 30 km but at sufficient height that the fireball does not contact the surface of the earth.