凿孔的

In order to implement simultaneous casing while drilling of larger diameter pile holes and water wells in complex strata, a new type of bit for simultaneous casing while reverse circulation drilling with DTH air hammer was developed.

为实现在复杂地层用同步跟管钻进工艺钻凿直径较大的桩孔和水井，设计了一种气动潜孔锤反循环跟管钻进钻头。

This is but a perforated drum, and if you go on beating it day in and day out, how long will it last?

这只不过是一个凿孔的鼓，如果你每天都继续敲它，它会用得多久呢？

This Grail appears only in the account of Arculf, a 7th-century Anglo-Saxon pilgrim who saw it, and through an opening of the perforated lid of the reliquary where it reposed, touched it with his own hand which he had kissed.

这个圣杯只是出现在阿尔库勒夫，一位公元七世纪的盎格鲁——撒克逊朝圣者的传说中，它一直静卧在盖子上有一个凿孔口子的圣物箱里，用他自己的双手来摸它，亲吻它。

Large degree of freedom of drilling frame structure can enlarge efficiently,stope blasthole slope hole and toe hole without combination with other special drilling machine.

多自由度钻架结构，全面地扩展了钻机的作业范围，能有效地穿凿采场炮孔，边坡孔及根底孔，不需要其他特种钻机配套。

This drill rig is suitable to drill blasthole,anchor-cable hole and grouting hole with φ85-φ125mm diameters,0-50m depths and any dip angle of 00-3600 in various rock formations in underground mines,open pit mines,water conservancy projects and other engineering such as hydroelectric,building,harbour,airport,road construction and consolidation of slope etc..especially suitable for the operation in narrow underground space.

其导轨架较为短小，占地空间小，适用于矿山井下和露天、建筑、水利水电、港湾、机场、道路施工及边坡加固等工程，尤其适合井下狭窄场地作业。可在各类岩层中钻凿φ85-φ125mm、深度0-50米，钻孔倾角00-3600任意角度的炮孔、锚索孔和灌浆孔。

This cylinder bore had been

这 汽缸的凿孔

Connecting with the practices of the shafting work in the water-source location of Sujigou, Zhungghar Banner, this paper expounds the technical details and drilling measures of the downhole hammer in the shafting process.

结合准格尔旗苏计沟水源地凿井工程的实践，阐述了潜孔锤凿井过程中的技术细节和钻进措施。

Series hd high air-press dth are designed as a hammer drill. they differ from other rock drills, however, through continuous operation down against the drill bit.

hd系列高风压冲击器是一种冲击凿岩工具，但他与其它凿岩工具不同的是，凿岩过程中它始终留在孔的底部，活塞直接冲击钻头。

Jinkai force DTH drilling rig license for its unique design, innovative construction, energy efficient, widely applicable to small and medium-sized mining, water conservancy, road construction, stonework Engineering hole, rock-drilling operation.

金凯力牌潜孔钻机以其独特设计、新颖构造、高效节能，广泛适用于中小型矿山、水利、筑路、石方工程中的炮孔、凿岩作业。

A bit for enlarging the upper part of a hole .

用来扩大凿孔上部的一种钻头。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。