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This product installment in feed water pipe's forehead and the civil air defense exit toward the outside, keeps off the wave and disappears the wave way to unify, prevents the shock-wave to enter the system facilities engineering, thus achieves eliminates has the destructive shock-wave, has the protective system facility normal work and the safety protection goal.

该产品安装于给水管道的头部和人防往外的出口处，以挡波和消波的方式相结合，防止冲击波进入系统设施工程的内部，从而达到消除具有破坏性的冲击波，起到保护系统设施正常运转和安全防护的目的。

It prevents juice from escaping, it diverts pulp efficiently toward a collector (13) or chute (150), it cooperates with a locking bar to keep the device safe and closed and it provides a platform for the feed tube.

它能避免汁溢出，有效地将果浆引向收集器(13)或废料槽(150)，它与锁条相配合以保持装置的安全和封闭状态，并且提供平台以安装进料管。

Firstly, the fabrics washed with it feel fluffy and soft, esp. for synthetic fibred fabrics, and it prevents static electricity and reduced electric spark and dust.

第一，织物经过这种洗衣粉洗涤后，手感蓬松、柔软、尤其是对含有化纤的纤物可起防止静电作用，减少织物电火花和吸尘。

Firstly, the fabrics washed with it feel fluffy and soft, esp. for synthetic fibred fabrics, and it prevents static electricity and reduced electric spark and dust.

第一，织物经过这种洗衣粉洗涤后，手感蓬松、软、其是对含有化纤的纤物可起防止静电作用，减少织物电火花和吸尘。

This allows the fuel to flow and prevents clogging of the fuel filter.

同时确保了燃料的流动，并有效防止燃油滤清器堵塞。

Prevents the fuel filter from becoming blocked with paraffin accumulation in severe cold.

防止燃料过滤器在严寒条件下被累积的石蜡堵塞。

By emitting heat that pushes away the galactic gas, the black hole prevents any new stars from being formed.

黑洞通过释放热量将星系气体排斥掉，阻碍了任何新恒星的形成。

An abnormal constriction of the foreskin that prevents it from being drawn back to uncover the glans penis.

包茎一种不正常的表皮收缩，它阻止表皮回缩而露出龟头

Accurate identifying it is very important that grape anthrax disease prevents and cure correctly.

准确识别葡萄炭疽病并正确防治十分重要。

Some hair tonic is good for the scalp and it prevents dandruff.

来点护发素对于头皮有好处，可以防止生头皮屑。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。