The outlet pressure of all those pumps were not lower than 0.1 Torr, and it follows that those pumps can run well by using directly the mechanical vacuum pumps as backing pumps without booster pump used.

In the multistation exhaust system a mechanic pump is used as the backing pump and molecular pump as the main integral part to form a high vacuum system.

由机械泵为前级泵，分子泵为主抽泵构成高真空系统，对高压开关管进行真空排气；

Analysis to the Back Swing Motion of the Backhoe Bucket Rod of Hydraulic Excavator and the Resolvent

液压挖掘机反铲斗杆回摆运动问题分析及解决方法

The specific operating sizes and the digging path enveloping drawing for hydraulic excavator with backhoe attachment

液压挖掘机反铲装置特殊工作尺寸及挖掘轨迹包络图

This paper briefly introduces the dredging system of the total hydraulic backhoe dredger designed and built for Burma, emphasizes on the working principle of the triple dolphin mooring system, the structure model of leg elevating device, its elevating and ship shifting method.

本文简要介绍出口缅甸的全液压反铲挖泥船的挖掘系统，特别是三桩定位系统的原理、桩腿升降机构的结构型式及其升降、移船操作方法。

Such as hydraulic backhoe attachment a 12-bar mechanism with three oscillating cylinder, if you use the above method, the process of operation will be very simple.

例如对于液压挖掘机反铲装置&三摆缸12杆机构，应用上述方法其过程十分简单。

Establishes a mathematical model by means of transformation matrix method and compiles the software system "WJJ" for the optimization of backhoe working mechanism of excavator.

本文应用变换矩阵建立了挖掘机反铲传动机构的数学模型，并编制了进行优化设计计算的软件系统WJJ。

This paper presents a method of innovative design for backhoe device of hydraulic excavator.

本文结合液压挖掘机构中反铲装置，提出一套创新设计方法。

Finite Element Dynamic Analysis on Working Equipment of Backhoe Single Bucket Hydraulic Excavator

液压反铲挖掘机工作装置有限元动态分析

One of the researches of the bucket bearing region of single bucket backhoe hydraulic excavator 《 The sign Description of the Excavating Range and the Division of Regions 》

单斗反铲液压挖掘机铲斗方位域研究之一&《挖掘范围的标记描述和区域的划分》

Research on Drawing Mine Map of Backhoe Hydraulic Excavator

反铲液压挖掘机挖掘图谱程序化绘制与实验

Backhoe excavator operations each cycle, including mining, Rotary, discharge and return to the course of four.

反铲挖掘机每一作业循环包括挖掘、回转、卸料和返回等四个过程。

Technology forehand and backhand swing swing by the ring, so that the distance longer racket swing speed, ball point toward the front, playing slash hitting the ball closer to the top point to a number.

正反手技术挥拍采用的是环式挥拍，这样球拍加速挥动的距离更长，击球点靠前，打斜线球时击球点要更靠前一些。

The 24-year-old also took advantage on Makarova's weakness from the backhand side. Sharapova took charge midway through the first set, and she finished it with a 6-4 count.

尽管马卡洛娃依靠犀利的防守反击以及莎娃的双误破掉了对手的发球胜盘局，但莎娃还是在关键的第十局再度破发得手，把首盘的比分定格在6-4。

To strike ( a ball) so that it spins in a reverse direction. a hard straight return made on the backhand side.

削球击（球）使其向反方向旋转在反手方向用力而且直接回击。

The characteristics of space application stage locked in bottom and sides "is the main backhand side".

相持阶段空间运用的特征是以底线和两边主要是反手位的边路为主。

A hard straight return made on the backhand side.

在反手方向用力而且直接回击。

A backhand stroke, shot, drive, etc.

反手击球、抽球、打球等。

Slicing is so much easier with a backhand ( shot).

用反手拍打斜射球较容易。

Especially for high-quality amateur backhand shot is a lofty ball technology can not only resolve the situation and give each other a passive cause some psychological pressure.

特别对业余选手来说一拍高质量的反手高远球技术不仅能化解被动的局面并且能给对方造成一定的心理压力。

A backhand shot made holding the racquet in both hands.

双手握拍进行反手回击。