环

In Chapter 1,we investigate BN-pairs of classical groups over local rings.We construct the BN-pairs arising from classical groups of linear,orthogonal and symplectic type over local rings.

本文主要研究局部环上典型群的BN-对，二面体群的BN-对和不变式环，有限域上典型群的极大子群和根子群的有理不变式域的结构。

The article roughs out some result about the mapping class group of a toms,including a classical theorem about the classification of all automorphisms of a toms.

文章介绍了关于环面的映射类群的一些结果，包括环面到自身的自同胚类的分类的经典结果。

However, during line construction s, dimensionally mismatches between the shackle clevis and the steel anchor of compression type strain clamp occur frequently, which cause difficulties in installation.

连接电力金具的U形环是按照国标(GB/T2315—2000)规定的尺寸进行加工，在线路施工时，经常会发生U形环挂耳与其连接的压接型耐张线夹钢锚在尺寸上不相配，造成安装困难。

The typical acute toxic symptom in earthworms was the tumescence of the segments with clitellum and seminal vesicles, especially the obvious tumescence even ulcerousness of clitellum.

蚯蚓的生殖系统对药物是最敏感的，蚯蚓急性中毒的典型症状是环带和贮精囊所在的节肿大，尤其环带肿大特别明显，严重者甚至溃烂。

In this paper, the force-energy formula which is suitable for double groove ball section ring is deduced based on force-energy formula of closed rolling... of rectangular cross-section ring by using micro-element method.

本文在矩形截面环件闭式辗扩力能公式的基础上，采用微元法推导了适合双沟截面环件的辗扩力能公式。

There are three principal types of system, Closed Loop, Open Loop and Hybrid Systems.

有三种主要类型的系统，闭环，开环和混合系统。

At last, experiment of open loop and closed loop system are completed, which is in accord with the simulation result. It verified feasibility and advantage of the control scheme.

最后完成了系统的开环和闭环实验，取得了和仿真一致的结果，从而验证了控制方案的可行性和优越性。

The feedback of the closed loop control system is comprised of position sensor and system software.

在轻压下压力控制系统中，设计了使用先导式伺服比例阀作控制元件，以压力传感器作为反馈元件的闭环控制系统；在速度控制系统，用变频器作控制元件，设计了由位置传感器和系统软件构成的速度传感器作为反馈元件的闭环控制系统。

On the basis of three-phase inverting circuit, this paper describes how to make the control method of open loop system in closed loop system.

以三相逆变电路为基础，阐述了如何将开环系统的控制方法用于闭环系统，并且介绍了这种新的控制方法在实际中的应用，证明了该方法的有效性。

According to the requirement of closed-loop frequency spectrum, a new PID parameters solving method based on closed-loop gain shaping is presented.

摘 要 根据闭环频谱要求，给出一种新的基于闭环增益成形的PID参数求解方法。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。