In this paper, the methods of variation of parameters for salving the Vacco dynamical equations are given.

1、

According to current engineering hydrodynamics, there's positively constant head loss in Bernoulli's theorem for identical stream line in viscous fluid, which can later turn into heat and dissipate.

现行工程流体力学与水力学理论通常认为粘性流体元流伯努利方程中的水头损失项是恒正的，并且这部分损失的机械能转变为热而耗散掉了。

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2、

According to real liquid movement equation we can know that liquid will produce energy losses when flowing because of viscidity, which make systematic efficiency reduce.

根据实际液体伯努利方程可知，液体流动时，由于存在粘性，会产生能量损失，使系统效率降低。

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3、

And to solve Bernoulli equation under production condition with analytic method has become possible.

从而解决了实际生产条件下，无法用解析法求解伯努利方程的难题。

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4、

By introducing enthalpy, the thermodynamic interpretation of Bernoulli's equation is given. It is also proved that the stable flow of ideal fluid is an isoenthalpic process.

通过引入热力学焓，给出了伯努利方程的正确解释，证明了理想流体的稳定流动是等焓过程。

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5、

A hydraulic computation equation for water distribution sytem of counterflow type natural draft cooling tower has been established by applying Bernoulli Equation.

运用伯努利方程建立了逆流式自然通风冷却塔（逆流塔）配水的水力计算方程。

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6、

According to Bernoulli Equation of unsteady flow, the hydraulic calculation model of multi-source pipe network based on graph theory in slowly transient state is established, which can provide more information of hydraulic elements in slowly transient state.

根据非恒定流伯努利方程，建立的基于图论的多水源慢变流管网水力计算模型，可以提供更多的慢变流情况下的水力要素信息。

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7、

Calculation method of piston air induced by train motion in subway tunnels is derived based on fluid continuity equation and Bernoulli equation. Further qualitative analysis is carried out on some key factors affecting the piston effect.

以流体连续性方程及伯努利方程为理论依据，针对地铁特点，推导得出隧道内列车活塞风的计算方法，并对影响活塞效应的因素做定性分析。

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8、

Bernoulli's equation is an important equation in fluid mechanics. The equation has different forms for various fluid flow. The note analyses and gives Bernoulli's Equation for incompressible fluids compressible gases and viscous fluids.

伯努利方程是流体力学中的一个重要公式，对于不同的流体流动方程的形式不同，本文分析并给出了不可压缩流体、可压缩气体和粘性流体的伯努利方程。

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9、

On the pressure-energy in the Bernoulli' sequation

浅谈伯努利方程中的压强能

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10、

The prominent characteristics of gear pump in application to flow metering and fluid transportation were introduced in this article.

文章介绍了流体力学理论如何和流量计量结合，给出连续性方程和伯努利方程在流量上的推导和经典的应用。

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11、

Bernoulli equation in human body

人体中的伯努利方程

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12、

We are charged with finding a safe passage for a single surface ship and fliers.

所以我们奉命寻找一条能容一艘水面舰船和快艇通过的安全通道.

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13、

Torpedo has been the mainly threat to large surface ship and submarine.

鱼雷已经成为大型水面舰和潜艇的最大威胁.

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14、

Every surface ship is not equipped with anti-ship missiles.

并非每艘水面舰艇都装备有反舰导弹.

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15、

Xiao Zhang has been Xiao Yuan's teacher for years but they rarely have chance to meet.

小张和小袁是多年西席,却一直难得一见.

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16、

Teacher Zhang is our family tutor, and we respect him very much.

张老师是我们家的西宾, 我们都很尊重他.

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17、

While the equivalent energy way will simplify the group into a new group of two linear equations and it increases the computing speed and accurancy.

而采用等效能量法后，可以将这个积分方程组转化为一个二元一次线性方程组来进行求解，从而提高了计算的速度和准确度。

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18、

By use of the continuous conditions between adjoining sections, ge-neral formulas of internal forces and displacements are derived and the prob-lem finally becomes to solve a simultaneous linear equations with two unk-nowns.

然后给出每一小段用初参数表示的解，再利用各段之间的连续条件，给出内力与位移的一般表达式，并最后将问题归结为一个二元一次方程组的求解。

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19、

A computer system that learns to solve simultaneous linear equations from examples

计算机通过样例学习解二元一次联立方程

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20、

Methods: The length of cervical spinal curving strings and arcs were measured on middle potential lateral radiographs in 378 normal persons cervical spines by computer imaging processing system, and the physiological curvature were figured out through solution of dualistic once equation.

方法：采用计算机图像处理技术，对378例正常人体颈椎中间位侧位片弦、弧长度进行测量，通过二元一次方程求解计算出正常颈椎生理曲度。

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