钻孔

For example, pressure,distance,nozzle hole diameter, line-number of swirling object, screw-pitch of swirling object and central hole of swirling object.

考察了工作压力、靶距、喷嘴孔径、加旋件头数、加旋件螺矩、及加旋件中心孔对钻孔效果的影响。

The time-domain response model of flaw long screw drill and pour pile was established based on the damped wave equation of pile-soil interaction system.

从桩-土系统共同作用的波动阻尼方程入手，建立了成层土中缺陷长螺旋钻孔灌注桩的时域响应模型。

The process of sand absorption is:(1) the vibration head vibrates and losses the sand layer, and supply high pressure air into the sand absorption head;(2) the high pressure air generates negative pressure in the sand absorption pipe when it is discharged out from the sand absorption;(3) the sand absorption head and the vibration are shifted downwards and maintains the water flow straightly.

取砂土的过程为：(1)振动头振动松散砂土层，同时向吸砂头供入高压空气；(2)高压空气通过吸砂头从排砂管向上排出的过程中，在吸砂管内产生负压，吸砂管将管口处的水和砂土吸入到吸砂头内，在高压气流作用下，吸砂头内的砂、水和气混合而成的三相流通过排砂管排出到受砂船上；(3)在吸砂的过程中，适时地将吸砂头和振动头下移并保持钻孔套管中的水流畅通。

The rock-drilling jamming mechanism of down-the-hole drill is discussed.

1前言在潜孔钻机凿岩钻孔中，经常发生卡钻事故。

High pressure revolving water jet technology has an obvious advantage in drilling large hole diameter and long continuous holes and is also characterized by high efficiency,energy saving,large and regular borehole,high rock-breaking efficiency when drilling coal seams.

高压旋转水射流技术在钻大井径、长连续孔方面具有明显优势，在煤层中钻井又具有高效、节能、钻孔大、成孔规则、破岩效率高等优点，因此在煤层气地面径向水平井技术和井下采空区钻长直井技术中广为应用。

In my opinion we recommend to use a combination of heavy spinning rod with fixed spool reel, or a multiplier, between 8ft to 9ft on boat gaming and 10ft to 11ft, on Rock hopping, when plugging.

我认为，我们建议重纺纱杆结合使用的固定周边同作卷或 8 呎，船上游戏及 11 的呎的岩石跳时插入到 10 英尺的 9 英尺之间的乘法器湾钻孔卷）。

NSK uses the standard ISO clearance designations such as C2, Normal, C3, C4 and C5 for bearings with an inner ring bore diameter greater than or equal to 10mm.

恩斯克采用ISO标准的名称，如清除C2 ，正常，补体C3 ， C4和C5的轴承内环钻孔直径大于或等于10毫米。

Accurate,widely useful gear head millin/drilling machine.

准确，广泛有用的齿轮头米林/钻孔机。

There is a low-head runoff electric station at lower reaches of principal river and the workshop is the style of riverbed. A successful example of dredging tail water riverbed with the blasting technology in an electric power plant is introduced with the measure of drilling dynamite for enhancing dynamoelectric benefit in the paper. The construction process flow, detonating parametric design and the security issues of the underwater demolition are discussed in detail and it will give light to the similar project.

摘 要：位於下游干流上某水电站是一座低水头径流式电站，厂房为河床式，为了提高机发电效益，本文结合了在某电厂用爆破法疏挖尾水河床的成功实例，利用钻孔爆破法对水下爆破进行施工，分别介绍了在该工程中进行水下爆破施工的施工工艺流程、爆破参数的设计以及水下爆破安全校核方面的内容，可供类似爆破工程借鉴。

There is a low-head runoff electric station at lower reaches of principal river and the workshop is the style of riverbed. A successful example of dredging tail water riverbed with the blasting technology in an electric power plant is introduced with the measure of drilling dynamite for enhancing dynamoelectric benefit in the paper. The construction process flow, detonating parametric design and the security issues of the underwater demolition are discussed in detail and it will give light to the similar project.

摘 要：位于下游干流上某水电站是一座低水头径流式电站，厂房为河床式，为了提高机发电效益，本文结合了在某电厂用爆破法疏挖尾水河床的成功实例，利用钻孔爆破法对水下爆破进行施工，分别介绍了在该工程中进行水下爆破施工的施工工艺流程、爆破参数的设计以及水下爆破安全校核方面的内容，可供类似爆破工程借鉴。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。