The deepest hole ever to be bored on land went down 25, 340 feet--considerably less than the height of mount everest . 迄今,在陆地上钻过的最深的洞为二万五千三百四十英尺远不如珠穆朗玛峰的高度。
The deepest hole ever to be bored on land went down 25 , 340 feet - - considerably less than the height of mount everest 迄今,在陆地上钻过的最深的洞为二万五千三百四十英尺? ?远不如珠穆朗玛峰的高度。
Risk factors are old age , poor cardiopulmonary compliance , pathological fracture , osteoporosis , large amount of cement , excessive pressurization with cement gun , and a previously undis - trubed intramedullary canal 危险因子包括老年人,术前较差的心肺状态,病理性骨折,骨质疏松,使用大量的骨水泥或骨水泥枪以进行骨髓腔管内加压作用,未曾被扩钻过的骨髓腔。