介绍了冲击地压的危害程度, 发生的原因 、 条件及采取的防治措施.The harm of percussive ground pressure, produced reason, conditions and protective measures are introduced.介绍了煤矿发生冲击地压的显现特征.This paper introduces the characteristics of impact earth press...
Soldier: Why does our ballproof garment resemble turtle shell?士兵: 为什么我们的防弹衣像龟壳?Make a few guns to make you much, I wore ballproof garment to come.为了让你们多打几枪, 我穿了防弹衣来的....