当油井生产形成压力降落大于油水密度差引起的重力差时，砂岩底水油藏锥进即会发生。
The coning of bottom water will happen as soon as the producing pressure drop of a well is higher than the difference of gravity caused by the difference of density between oil and water.
介绍了进排气系统一维非定常流动的FVM-TVD法（总残差减少的有限体积法）。
In this paper, a FVM-TVD method for simulation of one-dimensional unsteady flow in inlet and exhaust manifold of ICE has been constructed.
所得税按进差计，使收入较高者付较高的税率。
An income tax is graduated so that people who make more money pay a higher rate of taxes.
在分析底水油藏水平井开发底水脊进原理的基础上，建立了底水油藏水平井开发的临界生产压差计算公式。
Based on the mechanism of water coning of horizontal Wells in bottom-water drive reservoir the critical production pressure difference is obtained.
为研究进气系统结构参数对汽油机换气过程的影响，用有限差分法编制的程序对某3缸汽油机的换气过程进行模拟计算。
In order to find out the effects of inlet system dimensions on the gas exchange quality of gasoline engines, a FDM code was used to simulate the gas exchange process of a 3 - cylinder gasoline engine.
空气进气过滤器压差表，散件。
Air inlet filter pressure differential gauge, shipped loose.
研究差分格式对柴油机进气流动模拟计算结果的影响。
The effect of difference scheme on the simulation results of intake flow in a diesel engine was studied.
首先求出acf和其凸包的差函数，然后搜索差函数的最大值，从而得到进动周期的估计值。
The difference function between the ACF and the convex hull is obtained, and then the precession period is estimated by searching for the maximum value of the difference function.
为应用差集偶这种区组设计的方法研究最佳二进阵列偶提供了理论依据。
Theoretical basis for using differences set pairs to research perfect binary array pairs is provided.
研究了差集偶的性质，给出了差集偶与最佳二进阵列偶之间的关系。
The relationship between differences set pairs and perfect binary array pairs is given.
此系统用一个排气扇，手动调节反压闸，压差传感器和一个进气过滤器压差高报警开关。
The system uses a vent fan, a manually adjustable backpressure damper, a differential pressure-sensing gage, and an inlet air filter high differential pressure alarm switch.
他说，担心汇率风险可能会促使个人投资者试图在汇市打时间差，由此导致的资金频繁进会造成不菲的交易成本。
He says worrying about currency risk could prompt individual investors to try to time the currency markets and result in harmful transaction costs as they move money in and out.
我们得到了最佳二进序列存在的必要条件，给出一类差集偶的直接构造方法。
We obtained necessary conditions for the existence of perfect binary sequences, and presented a direct construction for a class of difference sets pairs.
当槽道进气角较小时，由于槽道进出口两端静压差减小，槽道对气流的加速作用下降，射流的作用效果也将降低。
When the slot inlet Angle decreases from the optimal point, the accelerating effect of slot is reduced due to less differential static pressure, thus the effect of jet would also be reduced.
差集偶是一类新的组合设计，一类特殊的差集偶与最佳二进阵列偶是等价的。
A special class of difference set pairs is equal to the perfect binary arrays pairs.
完美二进序列偶是完美二进序列的推广，其对应的组合结构称为差集偶。
The uniqueness of almost perfect punctured binary sequence pair is put forward and proved.
完美二进序列偶是完美二进序列的推广，其对应的组合结构称为差集偶。
The uniqueness of almost perfect punctured binary sequence pair is put forward and proved.
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