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A front-back seal ring structure is adopted in the pump to prevent the liquid from leaking from the high-pressure area to the low-pressure area. The front seal ring is mounted on the pump body while the back seal ring mounted on the bearing body. They should be changed when they are so worn-out that they have an effect on the efficiencyself-priming performance of the pump after the operation for a long time.

泵内部防止液体由高压区向低压区泄漏的密封机构是前后密封环，前密封环装在泵体上，后密封环装在轴承体上，当泵经长期运转密封环磨损到一定程度，并影响到泵的效率和自吸性能时，应给予更换。

Work Description: This is a beautiful place, beautiful, flowers, blue sky and white clouds, the distant green of the Castle Peak For droplets, the morning mist filled, meandering river and from the home front, the river on several boats, and long lines, a unique small houses, were a few trees around, there are two bottles of red small towers in front of the house, morning hostess is feeding seeds to the chickens , the host is doing morning exercises, enjoyable, the house next to a beautiful garden is my middle bird's-eye view of the road, living in such a beautiful and quiet place with nature together is a good place for home.

作品说明：这是一个美丽的地方，山清水秀，鸟语花香，蓝天白云下，远处的青山苍翠欲滴，白雾缭绕，小河从家门前蜿蜒而过，小河上几条小船，悠悠而行，一幢别致的小房子，被几棵大树围绕，门前有两樽红色的小塔，早晨女主人在喂鸡，男主人在晨练，其乐融融，房子旁边有一个美丽的花园，花园中间是我鸟瞰的小路，生活在这样一个风景秀丽又安静的地方与大自然融为一体，是居家的好地方。

The road on front of me was though the campus of the UIC, from the east to the west, I thought if I went up to the east along with the road, it would be the front of Michigon lake .

我面前这条大路是穿过UIC校园的，东西方向，我想我只要沿着这条路一直向东就一定能走到密歇根湖畔。

The pedal cords must be passed first through the rings fixed to the elastic in front of the board, then into the harness through the holes near the front corners of the seat, then through the pulleys placed near the rear corners of the seat and then up to the attachments on the paraglider risers.

脚蹬绳子必须首先通过被安在板子前面的圆环，然后再装入靠近座位前端的孔内，再通过在位子的后方角落附近安置的滑轮，最后将绳子穿上滑翔伞起飞装置的附件上。

Geography homework design should also the body living this principle now, this text front place homework and postposed homework design to do study:Front place homework proper and plain, have a direction type, personal with group cooperation combine together, have to open sex;The classroom homework want to with meticulous care choose while and then placing homework design, innovation design fill diagram homework and expand extension homework outside the lesson, homework outside the lesson also should recreation.

地理作业设计也应体现生本理念，本文就前置作业和后置作业设计做了探讨：前置作业宜浅显、具有导向型、个人与小组合作相结合、具有开放性；而后置作业设计时课堂作业要精心选题、创新设计填图作业、拓展延伸课外作业、课外作业也应休闲。

Geography homework design should also the body living this principle now, this text front place homework and postposed homework design to do study:Front place homework proper and plain, have a direction type, personal with group cooperation combine together, have to open sex;The classroom homework want to with meticulous care choose while and then placing homework design, innovation design fill diagram homework and expand extension homework outside the lesson, homework outside the lesson also should recreation.

郭思乐教授提出的&一切为了学生，高度尊重学生，全面依靠学生&的生本理念，注重培养学生学习的主动性和自主性。地理作业设计也应体现生本理念，本文就前置作业和后置作业设计做了探讨：前置作业宜浅显、具有导向型、个人与小组合作相结合、具有开放性；而后置作业设计时课堂作业要精心选题、创新设计填图作业、拓展延伸课外作业、课外作业也应休闲。

Magnet, which can offer adsorbability enough to keep the robot working on the vertical walls, is kept close to the outside surface of the pedrails. Front-wheel driving is adopted as the driving system and the two front-wheel are drived by two elctromotors, respectively. When the two motors are running with the same direction, the robot walks straightly. When the two motors are running with the contrary velocity, the robot can swerve.

本文设计的压力容器检测爬壁机器人采用履带式移动机构，双履带构成爬壁机器人的基本框架；采用永磁吸附方式，将永磁片贴在履带的外表面，可提供足够大的吸附力，结构简单；采用前轮驱动，两个驱动轮分别由电机驱动，当两电动机转速一致时，机器人沿直线行走，当两电动机差速时，可实现爬壁机器人整体转弯。

The restaurant also tools and so on top of a kitchen range or cooking stove, round-bottomed wok moves to in front of Taiwan, lets the customer in front of everybody demonstrate own kitchen skill, this enable the customer quite to have the sense of achievement.

餐馆还把灶台、炒勺等工具搬到台前，让顾客在大家面前展示自己的厨艺，这使顾客颇有成就感。

I believe in front of the piazza, is relying on in front of the temple old tree, gazes at the cigarette dense fog clouds to ascend gradually fills the air, proliferates slowly to the sky, condenses the crystal clear small snowflake as if, takes a rest the temple goes against brightly on the branch is dodging the silver charming light.

我信步廊前，倚着寺前的老树，注视着香烟迷雾的云朵渐渐升腾弥漫，慢慢扩散到天空，似乎凝聚成晶莹的小雪花，憩息在树枝上寺庙顶上熠熠地闪着银色的妩媚的光。

OK set up like a Nollie the put your front foot on the far side of the nose. Kick your front foot inward so the board will spin. After you can spin it try to land it. The board usually jumps forward so try to stay over it. This shouldn't be too hard of a trick but its a good one to know.

以Nollie姿势滑行，前脚放到板头前面一点，前脚向内用力，板就开始转了，你会转后就试着站上，板通常会往前跑，你就努力保持在板正上方，这不应该是太难的动作，但是个你要知道的好技巧。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。