双管的

The principle of determination of sound absorption coefficient of materials by transfer function method is introduced.

介绍了在阻抗管中采用传递函数法测量材料吸声系数的原理，详细介绍了使用双传声器进行测量的方法，指出了测试的频率范围取决于阻抗管的管径大小和传声器布置的位置。

In order to get the optimal noisy matching,analyzed and compared inside resistance and noise characteristics of bipolar junction transistor、integrated operation amplifier and junction field-effect transistorand the characteristics of three coupled modes.

为了达到最佳噪声匹配，分析比较了双极型晶体管、集成运放及场效应管的内阻、噪声特性及三种不同耦合方式的特点，从而总结出对于低内阻信号源较理想的前置放大器的有源器件是单级或多级并联双极型晶体管。

These topologies, combining advantages of single switch and dual switch forward DC/DC converters, are obtained by applying several classical reset schemes to dual switch forward DC/DC converter.

这一系列变换电路是将单管正激变换电路的几种典型的复位方式应用到双管正激变换电路中得到的。

Result］the total operative effective rate of double-tube diastematomyelia amounted to 86% during a follow-up period of 6 months to 15 years,more significant in patients with pain.the scores of neural function and ptncsep were significantly improved.

结果］双管型脊髓纵裂通过手术后观察和6个月～15年(平均2年6个月)的随访发现，临床神经功能评分及 ptncsep术后有明显改变，尤其是疼痛为主诉的患者恢复最为明显，手术的总有效率可达86%；单管型脊髓纵裂手术前后无明显变化。

Result］The total operative effective rate of double-tube diastematomyelia amounted to 86% during a follow-up period of 6 months to 15 years,more significant in patients with pain.The scores of neural function and PTNCSEP were significantly improved. But patients with single-tube diastematomyelia had no obvious change after operation.

结果］双管型脊髓纵裂通过手术后观察和6个月～15年(平均2年6个月)的随访发现，临床神经功能评分及 PTNCSEP术后有明显改变，尤其是疼痛为主诉的患者恢复最为明显，手术的总有效率可达86%；单管型脊髓纵裂手术前后无明显变化。

A bipolar pulse gener AT or with A valanche Transistor is introduced which uses two paralleled tubes to enhance the amplitude of the output pulse. Meanwhile the power supply voltage can be adjusted, so better synchronous triggering can be performed.

介绍了一种双极性雪崩三极管脉冲产生器电路；电路采用双管并联以增大输出脉冲的幅度，并采用调节电源电压的方法来达到良好的同步触发。

In this study, selective one-lung ventilation sounds were collected from patients intubated with a double-lumen tube, to investigate the efficacy of acoustic analysis for OLI detection.

在此项研究中，收集插入双腔管的患者单肺通气时的声音信号，以研究声学系统用于检测单肺插管的效果。

The deflection and circumfluence of flue gas in convection section would affect the heat transfer when one firebox is on decoking operation,and some tube's temperature would be higher.

双辐射室裂解炉采用两个辐射室共用一个对流段的结构，在一侧辐射室正常生产而另一侧进行烧焦操作时，对流室烟气的偏流和回流会引起对流炉管的受热不均，局部对流炉管传热能力下降。

A important factor affecting heat transfer ability of double metal rolling fin tubes is gas-side heat transfer coefficient .

影响双金属轧片式翅片管的传热性能的一个重要因素是管外气体一侧的对流换热系数。

Works for the Ministry of Construction of the project model works, all using H steel steel girder, rigid, by 8 degrees earthquake design and introduction of double-reinforced technology and GKP 11,300 panels, food warming on technology, the heating system to implement the "two-pipe into households, household metering, sub-room facility" management, and Practical intelligent technology choices, the installation broadband network and enhance the use of functions.

该工程为建设部立项的示范工程，全部采用H钢钢梁、钢柱，按8度抗震设计，并引进双钢筋叠合板技术和GKP外墙外保温技术，供暖系统实施&双管进户、分户计量、分室控温&管理，同时，选择实用的智能化技术，安装宽带网，提高使用功能。

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