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The vibration of drilling string in horizontal well is closely related with the overall length of the drill string and structural shape. In this paper ,a mechanical model of longitudinal vibration of drill strings is established by studying the overall drilling string,seeing a hole as arbitrary bending curve in three-dimensional space.

本文以整体钻柱为研究对象，将井眼视为一条可以任意弯曲的三维空间曲线，建立了水平井钻柱纵向振动分析的力学模型。

String music was preferred instrumentally and string orchestras were often larger than the string and wind ensembles of Venice, the doubling of the string parts being a common practice.

弦乐音乐的首选工具上和管弦乐团，往往比字符串和威尼斯的风合奏较大，该字符串是一个普遍的做法部分增加了一倍。

The influence of the excursion of the mass center of the torsional vibrating system of the three-string pendulum on the measurement of the moment of inertia is analyzed. A criterion for the mass center of the torsional vibrating system to be in alignment with the central axis of the three-string pendulum and a practical method to measure the moment of inertia of a body about a noncentral axis of mass using the three-string pendulum are proposed.

分析了三线摆扭振系统质心偏移对转动惯量测试的影响，给出了扭振系统质心与三线摆中心轴对齐的判别准则和用三线摆测定物体对非质心轴转动惯量的工程实用方法。

Static state of the string has a track that is located on the string and its very near surroundings, but thedynamic state of the string is the diagonal on which the ladder takes place.The track of a dynamic state is always bigger than the track of a static state.

举例来说，当一梯发生约一个字符串并通过棋盘沿对角线，静止状态的字符串有一个轨道，就是坐落于弦乐及非常接近的周围环境，但动态状态的字符串是对角线上的阶梯上露面。

The general shape of the amplitude of the vibrating string is a shallow curve that begins at one end of the string, is a maximum at the string's mid-span, and ends at the other end of the string, with the amplitude diminishing over time.

在一般的情况下，琴弦振幅的形状是一道很浅的弧线，它从弦的一端开始，到琴的中部是幅度最高，随着时间振幅不断减少，在弦的另一端消失。

Research results show that under AC voltage the voltage distribution of Y-type insulator strings is extremely non-uniform and the voltage distribution curve of Y-type insulator string is similar to that of I-Type suspension insulator string; under DC voltage the voltage distribution of Y-type insulator string is also extremely non-uniform, the voltage undertaken by the insulators at the conductor side of Y-type insulator string is higher than that undertaken by other insulators of the same string, and as a whole the voltage distribution trend is that the voltage undertaken by the insulators at both ends of the Y-type insulator string is higher than the voltage undertaken by the insulators at the middle of the same insulator string.

研究结果表明：在交流电压下，Y型绝缘子串的电压分布极不均匀，其电压分布曲线和交流悬垂I串类似；在直流电压下，Y型绝缘子串的电压分布极不均匀，绝缘子串导线侧绝缘子分担电压高于其它绝缘子，总体上呈现导线侧和杆塔侧两端高、中间低的分布趋势。

The whole contents were divided into six chapters. Chapter one is instruction, explains research motive and the purpose of study. In recent years the government vigorously promoted training policy of talented person -"A child has one kind of musical instrument; a school has a music mass organization." The result causes population increase that student play musical instrument in elementary school. Researcher has concentrated the string orchestra teaching in elementary school for many years. Researcher tries to provide the related information of string orchestra training by discussing this paper. That can help the promotion and development of the string education in elementary school.

本论文共分为六章，第一章绪论，说明本论文之研究动机与目的，基於近年来政府大力推广「一人一乐器，一校一艺团」之人才培训政策的结果，使得学习乐器的小学生人数增加，因此，笔者於多年来投注於国小弦乐团教学，拟藉此论文之研究讨论，提供弦乐团训练之相关资讯，以助於国小弦乐团教育之推广与发展。

Based on the violin, cello and double bass for the same position on the fingers rubbing strings rolling away from comparison and analysis of acoustic patterns; means single and double string rubbing rubbing means of acoustic string playing patterns and specific examples of analysis and comparison; refers to rub in the two-string Mixing strings with a single means to achieve the same sound, the string in the rubbing action on the comparison, so as to demonstrate the two-finger chord rubbing means smaller, the palm of your hand for a small, in the string rubbing speed, rubbing the string action is better than the single rate means the string rubbing , and can also increase the need for greater low-double bass string, the bit rate of rubbing

本文通过对小提琴、大提琴和低音提琴进行在同一把位上揉弦的手指滚动距离比较和声学图谱分析比较；进行单指揉弦和双指揉弦的声学图谱和具体演奏实例分析和比较；在双指揉弦与单指揉弦达到同样音响效果的情况下，在揉弦动作上的比较，以论证双指揉弦对于手指较细、手掌窄小的人来说，在揉弦速度、揉弦动作幅度上优越于单指揉弦，并且还可以根据需要更大程度上加大低音提琴低把位揉弦的幅度。

The first variable is a string array that will be used to keep the path file of the folder.

第一个变量是一个字符串数组，将用于保持路径文件夹。

In C and Pascal, I was able to use untyped pointers to allow the tree to hold any data type, but in both of these cases, I limited the key to be a string.

在C和Pascal，我可以使用无类型的指针，让树举行任何数据类型，但在这两种情况下，我有限的关键，是一个字符串。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。