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objective to evaluate clinical effect of the handling protaper nickel-titanium rotary instruments in preparation of canals of posterior teeth.methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling protaper rotary instruments using step-down technique,and by k files using step-back technique for control.all teeth were obturated with lateral condensation methods.the efficiency of preparation was analyzed with ra-diographs before and after operation.results no transportation,apical blockage and ledge were found in test.the technique could keep canals smooth.there were two ledge,one instrument fracture and nine transportation in control.the operative time was shorter and post treatment pain seldom occurred in handling protaper group.conclusion the handling protaper niti rotary instruments can prepare the canals effectively and safety.after the preparation,the canals could be easily washed,sterilized and filled.it is an efficient instrumentation method for posterior teeth's canals and be used widely.

目的 评价手用protaper预备后牙根管的临床效果。方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用protaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用k锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的x线片，评价后牙根管预备效果。结果试验组无根管偏移、根尖阻塞、台阶，且根管壁平滑流畅，无器械折断等并发症发生。对照组有2例台阶形成，器械折断1例，根管偏移9例。试验组操作时间短且术后疼痛轻微。结论应用手用protaper预备后牙根管快速、安全，成形效果好，易于根管冲洗消毒及填充，可视为临床上预备后牙根管的有效方法。

Nickel-Titanium instruments have become widely used in the endodontic treatment. However, their unexpected separation was a serious concern in endodontics. To date, no scientific methods have been developed to evaluate the functional lifespan of Ni-Ti instruments. In this study, we used resonance frequency analysis to nondestructively detect the fatigue life of Ni-Ti instruments to determine the feasibility of this technique for use in the clinic.

镍钛合金根管锉已经广泛的使用在牙髓病的治疗上，但其无预警的断裂也是令牙医师关心的问题，之前并无一科学性的方法来评估镍钛合金根管锉的寿命，而本研究室利用自然频率的分析方式对镍钛合金根管锉做非破坏性的疲劳检测，确定此方式可行且在临床上有应用的价值。

The instruments used ATmega16L onboard A / D converter channels to achieve the cold wind pressure, the hot blast pressure, the furnace top pressure and cold wind current capacity four way analog acquisition;used PWM waveform produced by ATmega16L internal timing / Counter to achieve the entire differential pressure ,the cold wind flow and the permeability index three-way analog output for recording instruments; realized the cold wind pressure, the hot blast pressure, the furnace top pressure, the cold wind current capacity and the entire differential pressure five group parameter tour demonstration and the fixed-point demonstration by key-elect key's coordination during demonstration blast furnace permeable index; produced acousto-optics alarm when the permeable index across the upper and lower limits;used RS-485 realizing the communication with the superior computer.

仪表利用ATmega16L自带的A/D转换通道实现对冷风压力、热风压力、炉顶压力及冷风流量四路模拟信号的采集；通过ATmega16L内部的定时/计数器产生的PWM波形来实现对全压差、冷风流量及透气性指数三路模拟量输出供记录仪表使用；通过键选键的配合在显示高炉透气性指数的同时实现冷风压力、热风压力、炉顶压力、冷风流量及全压差五路参数的巡回显示与定点显示；当高炉透气性指数越上、下限时，仪表产生声光报警信号；仪表采用RS-485与上位机实现通信。

Our factory is equipped with single/double screw extruders of high national and international standards, production line of banbury mixers, imported high-tech computer color monitoring instruments and precision electronic measuring instruments.

本厂拥有国际、国内高精密水平的单双螺杆机、密炼机组生产线、进口高科技电脑测色仪和精密电子计量仪。

Zhu Yuanping, born in Yixing, Jiangsu Province in 1952, has been ardently loved music since his childhood. He has studied to play various traditional Chinese instruments and western instruments. He has studied the bassoon with Mr. Liu Qi, a famous bassoonist. In 1983, he was enrolled to the Strings and Winds Department of Shanghai Conservatory of Music, studying the bassoon with Mr. Zhao Zhun.

CCTV.com消息：朱垣平1952年生于江苏宜兴，自幼酷爱音乐，曾学习过多种民族乐器和西洋乐器，后师从我国著名大管演奏家刘奇先生专攻大管演奏艺术，1983年考入上海音乐学院管弦系，师从赵准先生继续攻读大管专业。

The string quartet is that the instrument being that two is composed of the violin , a handful viola and a handful cello from four pieces of stringed instruments performs combination , their tone colour both unite and be rich in change, be expert in weave the body and refined exquisite lingering charm, four pieces of instruments have and the expressive power big and powerful equally , accord with thought of four west music middle parts habit at the same time, this combination becomes chamber music therefore, being hit by the have most typical ensemble of two or more instrumentalists , each playing one part form, Also become a composer express music thought having imitates a means deep and individuation most .

弦乐四重奏则是由四件弦乐器——两把小提琴、一把中提琴和一把大提琴——组成的乐器演奏组合，它们的音色既统一又富于变化，以细腻的织体和精妙的韵味见长，而且四件乐器均具有强大的表现力，同时又符合西方音乐中四个声部的思维习惯，因此，这种组合成为室内乐中最具代表性的重奏形式，也成为作曲家表达最深刻和最个性化音乐思想的有效手段。文章分析室内乐与弦乐四重奏的基本内容及关系，讨论弦乐四重奏的发展概况，最后探讨了弦乐四重奏的"民族化"及未来发展趋势。

It is a development bottleneck of oil monitoring lab to congruously manage the instruments and monitor the instruments' state and intactness online.

现阶段油液监测实验室中，各种仪器设备比较分散，如何对这些仪器进行统一管理，实现对仪器状态、完好性能等在线自动监测成了监测实验室发展的瓶颈。

Give him praise with instruments of brass and in the dance: give him praise with horns and corded instruments .

击鼓跳舞赞美他，用丝弦的乐器，和箫的声音赞美他。

With unique LCD touching display, input and output are integrated. It has been one of the instruments with the least cubage and most functions, compared to the similar instruments.

独特的液晶触摸显示屏技术，将显示与输入集成，成为在同类仪器中体积最小，功能最全的仪器之一。

As a result, the circulation and safety become the core legal value pursued by the whole Negotiable Instruments Law while demurrer of negotiable instruments is the essential system to realize the value.

但同时又绝对不能忽视票据的安全性，于是票据的流通与安全就成了整个票据法所追求的核心法律价值，票据抗辩正是实现这一价值的重要制度。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"