孔

The mentioned relationships are as follows: the relation between the total equivalent orifice or the total resistance of mines and the ventilation system of ...

这几项关系是：(1)矿井总等积孔或总风阻与矿井通风系统的关系；(2)矿井总等积孔或总风阻与风流某些断面上的空气压力的关系；(3)矿井总等积孔或总风阻与机械风压、自然风压的关系。

So, in this thesis, discussing the interrelated theory and by using finite element method,fixed Supported Square Plates with openings for different location and size of the openings are investigated. The mechanics rule of plates after openings are presented. A comparison is made for the above plates and the plates supported in three sides and the cantilever of plate in approximate boundary conditions. Some approximate results are obtained.

为此，本文论述了钢筋混凝土板的相关理论并用ANSYS软件分析了四边固支开孔板在不同开孔位置和形状、不同开孔面积的情况下内力的改变，获得了内力改变的规律，并和三边固支板、悬挑板在近似的边界条件下的受力倩况进行比较，得到一些相近的结果。

Mental and mandibular foramen of 250 Chinese mandibles were studied.

观察250个中国人颏孔及下颌孔的位置所得到的结果如下：1.78.4％的颏孔是在第2前臼齿的下方。2。

The diameter of the physiological foramen was measured with the software length measuring mode.

使用软件长度测量模板测量生理性根尖孔的直径，直径小于0.10mm的孔为副孔。

Dynamic pressure averaging pipe was generally applied to blowing rate measurement in rectangular pipe of power plant, the average velocity of flow in the section was represented by the average dynamic pressure at the line through the geometric center of the cross section, and then the blowing rate was determined.

针对这一问题，本文设计了基于"对数契比雪夫法"的送风流量测量装置，将5支动压平均管置于同一截面，按"对数契比雪夫法"选点位置开孔，把这5支动压平均管的静压输出孔、总压输出孔分别连接到一起作为传感器组件的差压输出，实验表明这种方法使测量准确度明显提高。

This research presented a new guide mechanism and belt driving theory of the abrasive band polishing for inner aperture, satisfied the driving requirement of abrasive belt leading smoothly into grinding area, realized the band grinding and band polishing of inner aperture, developed a abrasive band polishing headstock for of the ball track of ball bearing and roller bearing individually adopting a way of curvature concave oscillating and vibrating, researched the process regular and fundamental process method and parameter of abrasive band polishing of ball track. The results of experiments and tests showed that the surface roughness of ball track by abrasive band polishing can reach Ra0.02μm, and the original geometric cross section shape precision of ball track can be kept.

本项研究提出了砂带研抛内孔的新型导引机构和传带原理，满足了砂带平稳导入内孔磨削区的传动要求，实现了内孔的砂带磨削和研抛；研制了采用弧面摆动和振动方式分别用于球轴承滚道和滚柱轴承滚道研抛的砂带研抛头架；研究了轴承滚道砂带研抛的工艺规律和基本工艺方法、工艺参数；实验测试结果，轴承滚道砂带研抛的表面粗糙度达Ra0.02μm，研抛过程保持了滚道的原始几何截面形状精度。

At least one through-bore in each of the drill guide arms guides a drill bit at right angles into the work piece, with each through bore (17, 18) having an axial length sufficient for guiding a hand held drill to drill a work piece bore at right angles to the joint surface.

在每个钻孔导向臂中至少有一个通孔，用于以直角将钻头导向到工件中，每个通孔（17，18）都在轴向上足够长，以在与连接表面大致成直角的方向导引手持钻头来钻出工件孔。

Oil engine injector fitting hole and below side of cylinder head form a angle, this hole system can't be measured directly by measurer when they are processed. So a machining detector is designed, it can measure oil engine injector fitting hole handily.

柴油机喷油器安装孔与气缸盖下平面成一个角度，该孔系在加工时不能采用量具直接测量，因此，设计了一种检具，它能比较方便地测量柴油机喷油器安装孔。

The prescription of PCHA, which suit to the growth of normal bone, was selected according to the results of porosity, diameter and connecting pore examined by scanning electron microscope, dyeing of pore and experiment impressed with hydrargyrum.

PCHA的制备：预实验对13种制孔剂初筛，选出适合CHA原位固化成孔的发泡剂，并与原制备的CHA按不同重量配比，经扫描电镜、孔隙浸染以及压汞实验等方法，筛选出孔隙率、孔径分布和孔之间连通性适合骨生长的PCHA配方。

The validity of the final repair welding and reinforcement scheme has been confirmed by using of the hydraulic press for more than 2 years.

在论文的最后一章，作者还提出了在堵孔板中开出应力释放孔的方法来释放应力，并分析了应力释放孔对应力分布的影响规律。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失