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Firstly, this paper researched the mechanism of tubing string vibration when natural gas flows in horizontal well tubing string. Secondly, established whole tubing string undamped and damped vibration system model according as reasonable assumption data of one horizontal well. Apply finite element analysis software to calculate tubing string natural characters, simple harmonic dynamic behavior of stable gas production and nonlinear dynamic behavior. Finally, this paper carried out the safety varied frequency of gas well and the method of vibration reduction.

本文首先从理论和数值模拟研究了天然气在水平井油管柱内的流动诱发油管柱振动的机理，然后在合理假设的基础上结合某水平井数据建立了全井段油管柱无阻尼和有阻尼振动系统模型，利用有限元软件计算分析了油管柱固有特性、稳产简谐动力学响应和非线性动力学响应，针对油管柱振动规律提出了天然气安全调节频率范围和减振措施。

Therefore, we suggest that, the dentists should pay more attention to prostheses design on implant supported prostheses in edentulous mandible.

因此，以植体贋复作为下颚全口无牙患者的治疗，对赝复物的设计必须有完整且审慎的考量。

According to the report, have get online the 靑 of addiction year, use father the equipment that buys network game completely to 50 thousand yuan, after the event feels without Yan Jian's parents, unexpectedly envenom killed father and mother.

据报道，有个上网成瘾的靑年，将父亲给的五万元全用来购买网络游戏的装备，事后感到无颜见父母，竟下毒杀了父母。

Probably the most problematic situations are the naturally fractured formations where the operator may face total loss with no mud return in the annular.

大概是最有问题的情况下，是自然形成的裂缝所在的营办商可面对全损无泥回报，在环形。

Based on the full three-dimensional numerical simulation for the centrifugal pump, an optimal mathematical model of blade curve is set up. In this model, the object function is the minimum length of the blade curve; the constraint condition is no recirculation atr=0.5. This model makes the design of optimum blade curve efficient.

在对离心泵内部流场进行全三维数值模拟的基础上，建立了叶片型线优化设计的数学模型以叶片长度最短为目标函数，叶轮相对半径，r=0.5处无回流为约束条件，讨论了该模型优化计算的方法。

I need to eat something. That's low-fat, low-carb, fat-free...

我需要吃点什么全是低脂肪的低卡的无脂肪的。。。。

The special personality makes him do things and unavoidably go to extremes, finally in body have situation that settle down and get on with one's work get on dead end, Have chosen come to accomplish "loyalism being in a dilemma committing suicide great complete " magnificent feat.

特殊的性格使他做事难免偏激，最终在身无安身立命之所的情况下走上了末路，选择了自尽来完成"忠义两难全"的伟大壮举。

Leaves alternate,± sessile; stipules in pairs, small; leaf blade narrowly elliptic to almost needle-shaped, margin entire to incised.

叶互生，多少无梗；成对的托叶，小；叶片狭椭圆形到几乎的针形，边缘全缘到锐裂的。

Neverwinter Nights 2's graphics engine has been replaced by the next-generation Electron engine, which supports advanced graphical features like fully dynamic lighting, normal mapping, specular mapping, shadow maps, and more.

无冬之夜2的图像引擎已替换为次世代的电子引擎，它能支持更高级的图像特效如完全动态光线、法线贴图、全反面贴图、阴影贴图等等等等。

Furthermore, output demand uncertainty never affects investment if the industry faces a perfectly inelastic labor supply schedule.

然而，如果全行业面临的是一个完全无弹性的劳动供给时间表，产出需求的不确定性会对投资丝毫没有影响。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新