双管的

Under the given condition of acoustic driver, the acoustic field including oscillating pressure, volume flow rate and acoustic impedance in resonator was theoretically reconstructed by using the two-microphone method. The experiment results validate that this method is applicable and accurate for the positions with non pressure antinode and node in resonator. The maximum errors near antinode and node area are up to 12.4%.

在给定双声源条件下，采用双传感器法对该系统谐振管中的声场参数（包括声压、质点速度、当地声阻抗等）分布进行理论声场重构，并通过实验分析，证实了该方法在等径谐振管内非声压腹点和节点处的适用性和准确性，而在声压腹点和节点处的误差最大达到12.4%。

The check and measure methods of Bragg angle step and precision etc. parameters with high precision autocollimation are investigated.

针对同步辐射光束线中的弧矢聚焦双晶体单色器，研究了高准确度自准直平行光管对Bragg转角的步长分辨、转角准确度等参量检测的方法。

After process purification DNA needs once more magnetism bead purification processing, the magnetism bead under the specific liquid environment with the DNA adsorption, is fixed under the magnetic field function one side the centrifuge tube, only has DNA and the magnetism bead unifies in the together part is retained, then the use specific elutes the fluid clean, finally uses double steams the water to dissolve DNA, by now the magnetism bead and DNA were separated from, DNA preserved in the liquid, this obtained has purified, the high grade skeleton DNA sample.

在处理洗净DNA 需要一次更多磁性小珠洗净处理之后，磁性小珠在具体液体环境之下以DNA 吸附，是固定的在磁场作用一个边之下离心机管，只有有DNA 并且磁性小珠成一体在部份一起被保留，那么用途具体洗脱流动性干净，最后使用双词根水溶化DNA，在现在以前磁性小珠并且DNA 被分离了从， DNA 被保存在液体，这被获得净化了，高级最基本的DNA 样品。

A method of manufacturing the semiconductive belt pelletizes a mixture of a side-chain liquid crystalline polymer and a liquid conductive polymer and extrudes the mixture through a double bubble tubular injection molding apparatus.

一种制备该半导电带的方法，包括将侧链液晶聚合物和液体导电聚合物的混合物造粒，及通过双吹泡管状注射成型设备挤出该混合物。

KF43X-10 double seal self-defense against the current valve closure is my factory technicians on the latest research and development of products, mainly used in Qing reservoir overflow pipes, valves, there are usually a result of water-sealed to prevent sewage into the stench-money pool, As a result of heavy rains or sewer blockage caused by rain water pipe when the water level can be increased to prevent backflow of sewage-money pool, a good supply of health protection device.

KF43X-10双封自净式防逆水封阀是我厂技术人员研制开发的最新产品，主要应用于清蓄水池溢流管道上，平时因阀内有水封可阻止下水道臭气进入清水池，因大雨或下水道堵塞等造成雨污水管水位增高时可阻止污水倒流清水池，是良好的供水卫生保护装置。

We have studied silica single and double chain based on two-membered ring and nanotubes based on three-membered ring using the density-functional theory at 6-31G level.

运用密度泛函理论，在6-31G基组水平上，对二元环组成的Si02单链、双链纳米线和三元环组成的纳米管进行几何优化，并对其结合能、电子结构和振动频率进行计算。

We have studied silica single and double chain based on two-membered ring and nanotubes based on three-membered ring using the density-functional theory at 6-31G level. The average binding energy, electronic structure and vibration frequency were calculated.

运用密度泛函理论，在6-31G基组水平上，对二元环组成的SiO2单链、双链纳米线和三元环组成的纳米管进行几何优化，并对其结合能、电子结构和振动频率进行计算。

Using LM135 semiconductor temperature sensor, CPU and digital tube interface, a digital display free-air thermometer for helicopters has been developed sucessfully, which will take the place of the bimetal pointer thermometer.

半导体温度传感器具有较高的精度和良好的线性输出。采用LM135型半导体温度传感器，与CPU、数码管接口，经A/D和V/F转换等信号处理，成功研制了某直升飞机数字大气温度显示器，取代了双金属片指针式温度计。

To raise the sound intensity of the modulated aerodynamic acoustic source in low frequency region, the resonances in two resonance pipes, a straight pipe and a bi-curved horn were tested by forcing the airflow of sound wave to pass through them.

为提高调制气动声源在低频处的发声强度，将含声波的气流通过直管和双曲喇叭两种谐振管产生共振。

The experiment results show that not only the CNT's/FEA is suitable for FCT, and also provides a new way to realize a kind of small-sized dual colors character display tube worked under static station, this kind of tube is in low cost and saves energy.

实验结果不仅提供了一种碳纳米管阴极在玻璃真空平板型器件內应用的方法，也摸索出了一条实现小尺寸双色字符静態显示的廉价、节能途径。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐