To determine the type of pump, then in accordance with the flow and pump pressure head election.
确定泵的类型后，再依流量和压头选泵。
Simulation results were presented for the flow rate versus frequency, pressure head and input power.
得到了微型泵的频率特性，流量-压头曲线及流量随功率的变化。
The valve is an impeding part with larger pressure head loss and a lot of discharge energy consumed.
风量调节阀系阻性部件，存在较大的压头损失，须消耗大量送风能量。
Several basic characteristics on pressure head distribution at the surface of spur dike are described.
论述了坝体周围动水压力分布的若干基本材性。
The injection mould design of pressure head is introduced, and the points of design are also elaborated.
对押头注塑模设计的实例介绍，详细阐述了其中的设计要点。
Also known as the centrifugal pump lift pump pressure head, the weight of fluid monomer is received by the pump energy.
离心泵的扬程又称为泵的压头，是指单体重量流体经泵所获得的能量。
The pressure head of the liquid will decrease due to the friction on the surface of pipes when it flows through the pipes.
流体流经管道时，由于管道表面的摩擦力而产生力头损失。
Now the pressure head of the pump is not able to make precise calculations in theory, the general use of experimental methods.
目前对泵的压头尚不能从理论上作出精确的计算，一般用实验方法测定。
The actual flow reciprocating pump flow rate than theory, and with the increased pressure head decreases, which is due to leakage caused.
往复泵的实际流量比理论流量小，且随着压头的增高而减小，这是因为漏失所致。
The equations are solved by finite difference method and the mean and variance of pressure head are determined from its random expression.
通过摄动方法得到一系列关于水头展开式的偏微分方程，用有限差分法进行求解，获得了压力水头的随机描述，并计算其均值和方差。
Reciprocating pump flow and pressure head has nothing to do with the pump cylinder size, and the reciprocating frequency of the piston stroke.
往复泵的流量与压头无关，与泵缸尺寸、活塞冲程及往复次数有关。
It is considered that the main cause of subsidence at No. 9 measuring point in Heze urban district is due to the variation of deep pressure head.
认为菏泽市城区9号测点下沉的主要原因是受深层承压水头变化的影响。
The grate will be, at intervals, performed according to the settled time or to the automatic control of pressure head between fore and after-grate.
格栅的运行可按设定的时间间隔运行，也可根据格栅前后水位差自动控制。
The nonlinear relation between node pressure head of the pipe network and water capacity and pressure of water supply pump station was deduced by SVM.
利用支持向量机推求管网节点水头和供水泵站供水量、供水压力的非线性关系。
The mathematical model of hydraulic regime of ring-shaped heat-supply network is established, and the pressure head check formula for quota heating is given.
建立了环状管网水力工况的数学模型，给出限额供热的压头校核公式。
If the transport of liquid viscosity and density difference between the larger and water, shall account for the pump parameters: flow, pressure head and shaft power.
若被输送液体的粘度和密度与水相差较大时，应核算泵的特性参数：流量、压头和轴功率。
The characteristics of centrifugal pumps are sent to liquid capacity, the flow evenly, but the resulting pressure head is not high, and the pressure head as the flow changes.
离心泵的特点是，送液能力大，流量均匀，但产生的压头不高，且压头随着流量的改变而变化。
It is composed of open type engine body, hydraulic power cylinder, upper pressure head, and lower type box. The type box can be collocated with manual four-positions renewal.
有开式机身、液压动力缸、上压头、下字盒等组成。下字盒可配手动四位根据用户要求更换。
The recuperators have high air resistance , low air preheating temperature and high fan pressure head , and fan has much noise to environment and are apt to break down with vibration .
此换热器空气阻力大，空气预热温度不高，风机压头高，环境噪声大，风机振动大、易损坏。
The variability of the pressure head, velocity and hydrodynamic dispersion coefficient obtained from conditional simulation are smaller than those obtained from unconditional simulation.
条件模拟方法计算出的水头、流速和水动力弥散系数的标准差要小于非条件模拟的结果；
This article analyzes the traditional measures of releasing affixed pressure head and introduces the working principle of low and low gas pressure regulation and its application in hig buildings.
分析了消除附加压头的传统措施，介绍了低低压燃气调压器的工作原理及其在高层建筑中的应用。
Centrifugal pump characteristic curve on the efficiency of the highest point known as the design point, a pump at the point corresponding to pressure head and flow of work under the most economic.
离心泵特性曲线上的效率最高点称为设计点，泵在该点对应的压头和流量下工作最为经济。
It is suggested to apply the principle of effective gravity and equivalent pressure head to calculate the rotational speed and ingate area in the processing of grinding ball by centrifugal casting.
在离心铸球工艺中，可应用有效重度和等效压头原理计算转速和内浇口断面积。
But Doctor Vinocur says people have to be extra careful about putting pressure on bleeding head wounds.
但维诺科医生表示，人们在对头部受伤流血部位施压时应该格外小心。
We put a lot of pressure on them to be out there first, '' said Peder Holk Nielsen, head of Novozymes's enzymes unit. ``This is one of our must-win battles.
“我们给他们施加了不少的压力，鼓舞他们争夺第一”彼得·霍克·尼尔森---诺维信生物酶联盟的头头，如是说，“这是一场我们必须要赢的战役。”
In the summer, the ECB twice raised rates to head off inflationary pressure.
就在今年夏天，为转移通货膨胀的压力，ECB两次提高利率。
The average head weighs 7 to 8 pounds—a lot of pressure to be putting on your face every night.
头部平均重量是7-8磅——趴着的话对脸部可是不小的压力。
The average head weighs 7 to 8 pounds—a lot of pressure to be putting on your face every night.
头部平均重量是7-8磅——趴着的话对脸部可是不小的压力。
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