But Britain's DRA has now been largely phased out, and social norms are changing.

但目前，英国的DRA基本上已经被逐步取消，而且社会规范也在不断变化。

The fairly good structure of PGA fiber can be obtained at low spinning velocity and high after-dra…

采用低速纺丝高倍后拉伸的工艺路线可以得到具有较好结构的PGA纤维。

Objective To evaluate the value of high resolution ultrasound diagnosing on the dialysis related amyloidosis (DRA).

目的研究透析相关性淀粉样变(dra)的声像图特点，评价超声技术对DRA的诊断价值。

Working area for drag reduction agents (dra) is in turbulence area, and it can reduce resistance as well as increase transportation effectively.

减阻剂的作用区域在流体的湍流区，它能有效的降低流体阻力增加流量。

Field experiment results show that different volumes of DRA added can increase oil throughput of the pipeline and improve the safety of pipeline operation.

结果表明，添加不同量的减阻剂均可获得较好的减阻增输效果，并能提高管道运行的安全性。

A brief introduction to MLSSA(Maximum-Length Sequence System Analyzer)is presented, which is developed over the MLS signal theory by DRA laboratories, U. S.

介绍美国DRA实验室研制的基于最长序列MLS信号测试技术的扬声器电声分析系统MLSSA。

The bandwidth of the DRA is increased by using coplanar-waveguide inductive slot, and the size of the DRA is reduced by loading a L metallic strip on the DR.

其中，介质谐振天线通过采用共面波导馈电来提高带宽，通过加载倒L形金属片来减小体积，从而实现了宽频带和小型化的目的；

So it is necessary to study the optimization operation of hot oil pipeline after adding DRA, which can make optimal scheme and provide basis for scientific decision.

因此，有必要对热油管道中添加减阻剂的优化运行进行研究，制定最优运行方案，为科学决策提供依据。

The site application results show that applying HG dra not only obtain satisfactory drag reduction effectiveness and increase transportation capacity of pipeline, but also ensure the safe operation.

现场应用结果表明，添加hg减阻剂不仅具有较好的减阻效果和增输能力，提高了输送的经济效益，同时保证了输油生产安全平稳运行。