What was the directional flow of U. S. territorial expansion?
美国的领土扩驰是朝哪个方背的？
What was the directional flow of U. S. territorial expansion?
美国的领土扩张是朝哪个方向的？
Suitable for Vacuum directional flow applications, but NOT for Holding Vacuum.
适用于真空定向流量应用领域，但不能维持真空。
Note how some shapes and directional flow are repeated (a manifestation of translational symmetry).
要学习各种形状和流程的重复使用(这是平移对称的展现)。
Some languages provide keywords that enable you to modify the directional flow of method parameters.
某些语言提供使您能够修改方法参数的方向流的关键字。
It possesses the advantages of simple structure, audio-visual and convenient, and can measure dual directional flow.
具有结构简单、直观方便、能测双向流量等优点。
The procedures to divide bi-directional flows into two single directional flows are discussed. The formulae for OD flow calculation are derived.
并描述了将双向交通流分解为单向交通流进行推算的过程，给出了通道OD递推公式和相应条件。
Quadrature phase method is one of the important methods in directional blood flow information detection using Doppler ultrasound techniques.
正交相位法是超声多普勒技术中提取双向性血流信息的一种重要方法。
YZZ vibration flow aiding machine is a newly developed ore drawing device, which is devised on the basis of the theory of autogenuous synchronization and directional vibro excitation.
采用自同步定向激振理论设计，将重力自溜与振动出矿融为一体的YZZ型振动助流器，具有分节组合、大倾角、无侧板的结构特点。
A simple but accurate method is developed to realized directional and quantitative measurement of blood flow velocity.
提出了一种实现血流速度定量、双向检测的简单而且准确的方法。
The directional control line of valves are available in a wide range of port sizes and Cv flow capacity.
该生产线的方向控制阀，可在流量范围广泛的港口规模和简历。
Experimental results show that three-phase PWM converters are advantageous in high power factor, small input-line current harmonic distortion and bi-directional power flow.
实验表明，作为双馈感应发电机转子励磁电源的三相pwm变换器具有功率因数高、网侧电流谐波小、能量双向流等优点。
In this paper, a new structural cleaning bench, double directional and horizontal parallel flow cleaning bench, is presented.
本文提出了一种新型结构的净化工作台——双向出风水平层流净化工作台。
The studying results show that the converter has the advantages of bi directional power flow, high efficiency, simple control scheme and good dynamic response.
研究表明，该变频器具有以下优点：双向功率传输、效率高、控制方案简单以及良好的动态响应。
Local directional change of the flow field in the vicinity of spur dike would result in local scouring of spur dike.
丁坝(群)附近的局部流场变化是引起丁坝局部冲刷的根本原因。
So in effect the proportional directional valve is acting as both a directional valve and a flow control valve.
于是在实际上比例阀可以同时作为方向阀和流量阀来使用。
This paper analyzes the two operation modes of the push-pull full-bridge bi-directional DC /DC converter and conduct a simulation analysis. In theory, the two-way flow of energy is possible.
文中分析了推挽全桥双向DC/DC变换器的两种工作模式，并进行了仿真分析，理论上验证了其实现能量双向流动的可行性。
The utility model discloses a pneumatic control multi-way directional valve applied to a remote pneumatic-control hydraulic system with the coexistence of large flow rate and small flow rate.
一种应用于远程气动控制液压系统的大、小流量并存的多气控换向阀。
The case study of non-excavating directional drilling technique in power engineering is introduced, flow sheet, construction equipment and pipe installation of non-excavating technique are analysed.
结合河南省开洛高速公路非开挖铺设管线工程 ，简要分析了水平孔钻进弯曲机理 ，详细介绍了工程施工技术方法及效果。
Venant's differential equations. The general analytical solutions of 1st and 2nd approximations have been given for one directional wave flow which propagates into the steady flow region.
对向定常流区推进的单向波问题给出了解的一级近似和二级近似的普遍表示式；
Venant's differential equations. The general analytical solutions of 1st and 2nd approximations have been given for one directional wave flow which propagates into the steady flow region.
对向定常流区推进的单向波问题给出了解的一级近似和二级近似的普遍表示式；
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