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In this paper, through the practice of solving roll marks on steel pipe, on spiral welded pipe of N820 in the steel pipe factory of Shengli oil-field ManagEment, the reason of roll marks occurence on steel pipe was primarily analysized, and some measures to reduce the roll barks of pipe are put up.

通过在胜利石油管理局钢管厂820螺旋焊管机组上解决钢管压痕问题的生产实践，对管体压痕产生的原因进行了初步分析，并提出减轻钢管压痕的一些具体措施。

This topic is designed to protect the oil pipe thread spinning apparatus for equipment design, In the design process, the teacher asked us to use the knowledge to complete electro-hydraulic design features include spinning machine tool design、 The top end of the design, spinning mechanical design, hydraulic control system design, the design of the transmission system, electrical system and the PLC design.

本次设计题目是石油管螺纹保护帽旋压专用设备设计，在设计过程中，老师要求我们运用机电液的知识完成，设计的内容主要包括，旋压机床总体设计、尾顶的设计、旋压机构设计、液压控制系统设计、主传动系统的设计、电气系统及PLC的设计。

The precision of the press is high, the lower part of the press plate is a straight line guide.

压合精度高，压合板下部独有直线导轨，充分保证高精度平行压合。

This research sets the target of zinc die-casting design, the craft parameters parts crafts analysis, the choice of die-casting machines and platoon Yak system design, the introduction of institutions, national aircraft design, shape parts design, structural components design, die-casting mould technical requirements and material composition, a total of nine chapters.

本课题研究的对象是锌套的压铸模设计，包括工艺参数的选择，零件的工艺分析，压铸机的选用及排溢系统的设计，推出机构，模架的设计，成形零件的设计，结构零件的设计，压铸模的技术要求及选材等，本课题的设计论述出了各部分的设计方法与原则以及计算设计过程和必要的强度校核。

Minimum holding pressure: based on the correct switch point, the pressure

最高保压压力：在精确的转压点基础上，给予一定的保压压力，当产

It's optimum to set it at the location around the third insulator from the conductor side. According to the experiments, the corona discharge often happens around the groove between the ball pin and the porcelain shell.

均压环可以有效的改善导线侧绝缘子的分布电压，经过对均压环的优化计算表明，在能保证放电间隙有足够闪络距离的条件下，均压环装在靠近导线侧第3片绝缘子上下的位置最佳。

The two primary types of pressure plate assemblies are coil spring assembly and diaphragm spring .

有两个基本类型的压盘是螺旋弹簧组压盘和膜片弹簧压盘。

With the same of characteristics between solid and porous microchannel evaporator, that pressure drop rises with the increase of volume flow rate and heat flux, the latter's pressure drop will rise up around 30% to 260% as porosity increases.

在压降方面，相较於传统微流道蒸发器压降除了随著流量以及热通量的增加而上升外，多孔性结构微流道蒸发器的压降也会随孔隙度的增加而上升。

The issue analyses and calculates the linear pressure loss and local pressure loss in spot example in the process as well as gets a conclusion.When several compressors in serial connection provide compressed air,the more the compressors be connected,the more the pressure loss to be happened,and gives a few of methods to reduce the pressure loss.

以实例详细计算了压缩空气在输送过程中的沿程压力损失和局部压力损失，并得出了结论：当多台空压机串联供气时，串联供气的空压机的台数越多，其串联在后面的空压机输出的局部压力损失就越大，并给出了克服压力损失的几种方法。

A new scheme based on the features of slow shot process was developed to calculate wave profile in the chamber.

作者还根据慢压射的特点开发了慢压射过程压室中流场的计算方法。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。