管道中的

In view of corrosion phenomenon occur on the pipeline of oil field, this thesis studied three kinds of anticorrosive pipelines which were used in the construction of oil field.

针对油田管道的腐蚀现象，本文研究了油田地面工程中三种防腐性能优良的管道。

The uncovered tracts and the liver wound surface were managed by some of the methods combined such as high frequency electrocoagulation, titanium clamp, suture, hemostatic gauze oppression, argon-beam coagulation, protein glue adherence, and Endo-GIA switcher. The total operative outcome, operating time, blood loss, postoperative complications and postoperative hospital stay were summarized in order to assess feasibility and safety of the clinical laparoscopic liver resection.Results: 1. Laparoscopic liver resection with clamp dissection method needs only the ordinary laparoscopic equipment. It has a low cost but causes a little more bleeding. 2. Laparoscopic liver resection operated by microwave tissue coagulation method had very little bleeding when dissecting hepatic parenchyma. The operative field is clear and the cost is low. It is a safe, convenient and effective method. 3. Ultrasound dissector is a relatively ideal appliance for laparoscopic liver resection at present because ofless bleeding during operation. But the speed is slow thus prolongs the operation time. Its separating intensity is not strong enough, and it can only be applied to patients without hepatic cirrhosis. 4. Ligsure has clamp dissection and electrocoagulation functions. It can carbonize hepatic tissue including the tracts whose diameters are less than 7mm. It has some advantage in dissecting. However, it has the shortcomings of the clamp dissector during coagulating. 5. Hand-assisted laparoscopic liver resection can make use of the flexibility and feeling of the operators left hand.

结果：1、钳夹分离切肝法不需特殊仪器设备，只要具备常规的腹腔镜器械即可实施，成本低，肝断面较易渗血；2、微波固化切肝法肝实质出血很少，视野清晰，成本低，操作简单，是一种安全、简便、有效的方法；3、超声刀是目前较为理想的切肝器械，术中出血少，但是，切割速度慢，手术时间长，而且，切割强度有限，适用于无肝硬化的肝切除；4、Ligsure具有挤压粉碎及高频电凝止血两大功能，可使包括7~以下管道的肝组织碳化、形成焦痴，具有一定的优势，但是，也存在分离钳电凝止血的缺点；5、手辅助腹腔镜肝切除可以利用术者左手的灵活性及手感，便于术中显露、分离、控制出血等，可随意协助右手及助手的主要操作，缩短了手术时间，大大提高了腹腔镜肝切除的安全性，李朝龙等的改良方法，同样达到了手辅助目的，又节省了费用；6、小切口腹腔镜辅助切肝法可以使用剖腹肝切除常规器械及剖腹肝切除技术，操作简单、可靠，适用于肝左外叶切除及右肝第V段切除；7、Endo一GIA切肝法在离断肝组织的同时闭合管道结构，多用于肝左静脉、门静脉分支、管径较大胆管的切割，缺点是不能用于较厚肝组织的切割，而且价格昂贵；8、临床巧例腹腔镜肝切除均获得成功，手术时间最短1.5h，最长sh，平均125 min，多数在100 min左右，手术出血量最少50 ml，最多500 ml，平均1 78 ml，除2例合并严重肝硬化的原发性肝癌患者术后出现少量腹水，1例术后发生胆漏外，其余无并发症，发生胆漏的1例患者术后住院40d，多数在术后一周左右出院，术后住院时间5一40d，平均gd。

However, if one tube is closed the open tube may become two-way and special Traffic control and signs will be used to guide you.

不过，如其中一条管道封闭，通车的一条管道便会双程行车，届时会有特别的交通控制措施和标志，指引驾驶人。

Pipeline stress calculation and Euler formula, as well as the theory of forced convection heat transfer in tube, are used to solve the problem of large deformation and uneven distribution of stress which occurred in thermal pipeline of a power plant.

通过应用管道应力计算方法、欧拉公式以及管内强制对流换热等传热学理论，解决了某电厂热力管道运行中出现的变形过大、应力分布不均的问题。

This paper discusses the status of low-pressure pipeline irrigation technology related to the concept and main content .

本文针对这一现状介绍了低压管道灌溉技术的相关概念和主要内容，并以山西省阳高县大白登镇基本农田整理项目为例，详细介绍并分析了在土地整理项目中低压管道灌溉系统的规划设计方法以及相关水力计算。

This text primarily introduce PE pipe in not open dug technique applied of a few construtions method, and how to come to satisfy the different applied construction.

本文主要介绍了PE管道在非开挖技术中应用的几种施工方法，以及PE管道如何满足不同应用范围的施工。

Because of the restrictions introduced by the abrasive feed tube geometry, a vacuum gradient is generated along the tube.

实际应用中，磨料罐出口与射流喷嘴由一管道连接，由于管道一端与大气相通，另一端与具有一真空度的混合腔连接。

The FRP tube has a very slippery surface, with roughness rate only 0.009, which is considered as perfect slippery Tube for hydraulic. In daily usage, the wall of the tube of steel, iron or concrete are often corrosive and become rough, while the cross-winding tube can keep a clean and slippery wall surface.

玻璃钢管道内表面相当光滑，一般表面粗糙率可达0.009，几乎可以认为是&水力学光滑管&，在实际运行中，钢管、铸铁管、水泥管等的内表面，经常发生局部腐蚀，变得越来越粗糙，而往复交叉缠绕玻璃钢管道始终保持着新生管表面光滑状态。

The unique built-in non-return structure, when the pump stop, will avoid any water hammer and vacuum condition inside pipeline, protect the pumps and pipes, also to prevent the sand sink into pump and cause block.

采用独特的防返流结构，水泵停机时不会产生水锤现象以及避免了管道产生真空状况，保护了水泵和输送管道，同时可以防止沙子沉淀到泵中产生卡机。

In the light of common quality problems of the installing of outdoor drainpipes,the paper has analyzed the causes and put forward a few precautionary measures with a present project as an example.

本文针对排水管道工程施工中常见的一些质量通病，结合我们正在施工的庆阳市市直机关住宅小区室外配套工程中排水管道安装工程这一实例，根据施工现场出现的一些质量问题，分析原因，提出有效的防治和预防措施

The basic concept of FOP can be summarized as to further optimize effective prescription according to the standard of curative effects and with the aid of modern science and technology and theories of traditional Chinese medicine.

其基本内涵可概括为：以确有疗效的中药复方为研究对象，以现代科学技术和传统中医药理论为技术支持，以该复方所治病证的药效响应为评价标准，以优化重组疗效更优的新复方为研究目的。

Ever since our world has been a world, native forests have been indiscriminately exploited by man.

自从我们的世界一直是世界原生森林被任意剥削人。