Mean While, loading force provided by the force loading maintainer has been compared with the actual breech pressure, and the method which more in line with practical gun pressure has been put forward.

Impact stress of buffer spring in machine gun cartridge extraction in automatic-weapons under high breech pressure& a theoretical study

自动武器中缓冲簧的撞击应力自动武器高压抽壳理论研究

And calculated breech pressure, muzzle velocity and discharge parameters agree with experimental results.

同时，计算的膛压、初速、放电参数与实验基本符合。

Breech position caesarean sectionshouldmaster the skill of breech extraction, operating according to breech deliverymechanism.

对于臀位剖宫产应掌握好臀牵引术的技巧，应按臀位分娩机转进行。

Their methods delivery included 73 cases of assisted breech delivery, 86 cnses of breech extraction, 40 cases of cesarean section and 5 cases of breech extraction plus craniotomy.

，均系臀牵引术分娩.臀助产73例，臀牵引86例，剖宫产40例、牵引+穿颅术5例。

Results Compared with natural delivery, in presence of assisted breech delivery, breech extraction, application of vacuum extractor, and cesarean section, the incidence rate of neonatal asphyxia increased significantly ( P < 0.01).

结果①臀位助产、臀位牵引、胎头吸引术、剖宫产术的新生儿窒息率经统计学处理明显高于自然分娩率（P<0.01）；

Results Fetal hypoxia, birth injury, premature, postmature pregnancy, huge baby, difficult vacuum extraction, forceps operation and breech extraction were the most dangerous elements of intracranial haemorrhage of newborn.

结果：新生儿颅内出血与胎儿缺氧及（或）产伤有关，早产、过期妊娠、巨大儿、困难的胎吸、产钳术、臀位助产术是颅内出血的高危因素。

The breech lock closure type heat exchanger is characterized by reliable sealing performance, easy dismantling and assembling, high utilization ratio of heat exchange area and small grounding.

螺纹锁紧环换热器具有密封性能可靠，拆装方便，换热面积的利用率高，结构紧凑，占地面积小等特点。

Based on different theories and techniques for the reduction of stress concentration, and on the basis of forms of breech ring fillets in general use, over a dozen of fillet forms are proposed.

根据降低应力集中的理论和技术措施，在现有常用的炮尾闩室圆角的基础上，提出了十几种圆角形式。

In order to meet the technical requirement of breech ring blank, the past single piece forging for high& mid-strength steel breech ring blank was changed into multiple length forging.

在满足炮尾毛坯锻件技术要求的前提下，采用倍尺锻造法和直接拔长工艺代替传统的单件锻造工艺。

Based on the theory of Multi-body Dynamics, we adopt ADAMS simulation platform and establish virtual prototype of breech mechanism.

基于多体力学理论，采用ADAMS软件平台建立了炮闩系统的虚拟样机。

Study on On-line inspection method of tank guns breech mechanism based on LABWindows/ CVI

基于LABWindows/CVI的坦克火炮炮闩在线检测方法研究

Failure analysis for the breech mechanism of a big caliber howitzer

大口径火炮抽筒故障分析

Assembly Level Finite Element Analysis of Breech Mechanism of Gun

炮尾炮闩机构装配体有限元分析

Some New Results About Parts' Dynamic Characteristics in XX Breech Mechanism Based on Virtual Prototype Technology

基于虚拟样机技术对某炮闩系统零部件动力学特性的若干新认识

Research of Fault Simulation and Prediction System for Breech Mechanism

炮闩系统故障仿真预测系统研究

I was also in breech presentation.

我那时也是臀位的。

The choice of mode of delivery for breech presentation in nulliparous women

臀位妊娠分娩方式的选择

Related factor analysis of outcome of breech presentation perinatal with single pregnant and primipara

单胎初产臀位围产儿预后相关因素分析

Study of the Relationship between Breech Presentation and the Increasing of Fetal Umbilical Artery Blood Flow Resistance

胎儿脐血流阻力增加与臀位的关系探讨

There was a positive correlation between GPDA and N acetyl � � D glucosa minidase ( NAG ), urine minimal albumen ( UmA ).

尿GPDA与N乙酰βD氨基葡萄糖苷酶 ( NAG ) 和尿微量白蛋白 ( UmA ) 呈显著正相关.