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...
Bead trigonometry area basically is how to come true agrotechnical span problem.珠三角地区主要是如何实现农业技术跨越问题.The climax of this work was the development of trigonometry.三角术的发展是这项工作的高峰.He received a low mark for trigonometry.他的三角...
偏头痛的其他诱因还有电脑的视频显示器和灯管照明。Other causes of migraine are VDU screens and strip-lighting.这些症状尤其与偏头痛相关。These symptoms are particularly associated with migraine headaches.我得了偏头痛。I'm getting a migraine....