though a preliminary investment of vortex flow meter is a bit higher than orifice, its free maintenance, high precision, stable in operation and good performance make it possible to replace orifice in certain extent.

the scroll wrap is the main movement part of compressor, only have the tooth, have no abrasion, thus the life is longer, so this is free maintenance compressor.

涡旋压缩机主要运动件涡盘只有啮合没有磨损，因而寿命更长，被誉为免维修压缩机。

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the permanent magnetic actuator ( pma) is characteristic of few parts, free maintenance, high reliability and adaptability to the vacuum circuit breaker ( vcb).

永磁操动机构的零部件少、免维护、可靠性高，与真空断路器的特性配合良好。

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the result shows that rocos is an excellent compact spinning device producing good quality yarn with small investment and free maintenance.

结果表明，ROCOS是一种投入少、免维护、纺纱质量好的紧密纺装置。

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in the network function, the network structure was simplified, the daily maintenance work also was reduced, realizing the cell data free maintenance.

在网络功能方面，简化网络结构，减少日常维护工作的工作量，实现小区数据免维护。

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the practice proves that this system can be effectively increase the level of free maintenance and operation reliability of dc adjusting speed control system.

实践证明，该系统能有效提高直流调速传动控制系统的运行可靠性及免维护水平。

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the fan, air duct can keep clean, no grease, free maintenance, eliminating fire damage;

风机、排风管，能保持洁净，无油垢、免清洗，消除火灾隐患；

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cutting torch, air reducing valve and so on are not in the scope of free maintenance.

割炬、空气减压阀等不属于免费保修范围。

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one year free maintenance service is granted for the troubles resulting from normal use within the warranty period.

保固期内，于正常使用下出现的故障，免费维修。

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furthermore, we guarantee free maintenance service for all our products during warranty.

所有产品保修期内、免费提供维护工作。

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induction motor is used widely for its advantages of small volume, low cost, performance reliable, light weight and free maintenance.

感应电机具有体积小、成本低、性能可靠、重量轻、免维护等优点，在电动汽车中得以广泛应用。

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the paper designs a kind of high-voltage vacuum circuit-breaker with good performance, and free maintenance.

设计了一种高性能、免维护的高压真空配电装置，为实现井下变电所无人值守奠定基础。

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inspection must be carried out regularly in order to ensure the automobile's safety capability, which include four-wheel alignment, headlamp, chassis, brake, side slip and so on.

为了确保机动车的安全性能，必须经常对其进行检测，检测内容包括四轮定位、灯光、底盘、制动、侧滑等等。

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four-wheel alignment, as a basic equipment of vehicle inspection and test is also the core equipment to measure and calibrate the parameter of wheel alignment.

作为汽车检测的基本设备&四轮定位仪，是汽车检测维修行业的核心设备，用于测量和校准汽车的车轮定位参数。

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therefore, developing a four-wheel alignment with good performance and full function seems to be not only of theoretical significance, but also of good market prospect.

因此，研制性能优异、功能完善的四轮定位仪，不仅具有一定的实用意义，同时拥有较好的市场前景。

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intelligent anti-theft alarm system with the advantages of power and control algorithms, can give a number of related companies of the technological revolution brought a certain reference value, but also for competition in product markets has brought vitality, stimulate the market, good development.

智能防盗报警系统具有功耗和控制算法的优势，能够给一些相关企业的技术革命带来一定的参考价值，也为市场中的竞争产品带来了活力，刺激市场的优良发展。

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at present, all kinds of functions of the household anti-theft warning system are more and more perfect in the fixed place, but personal alertor outside for self-defense is seldom.

当前，固定场所的家居防盗、报警系统功能日益完善，而针对个人出门在外的防身报警器却较为少见。

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the utility model provides an infrared detector for human body adopting a pyroelectric infrared sensor which can be used for an automatic lighting system and an anti-theft alarm system.

本实用新型提供了一种采用热释电红外传感器的人体红外探测器，用于自动照明系统，防盗报警系统。

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this paper firstly multimedia classroom anti-theft alarm system the research background, the purpose, significance and alarm system of existing features, development of the system of the related technical basis.

论文首先阐述多媒体教室防盗报警系统研究的背景、目的、意义及国内外报警系统现有的特点，开发本系统的相关技术基础。

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a new oil pipeline monitoring system based on gprs transmission is put forward in this paper on the basis of the current anti-theft detection system of oil pipelines.

本文在目前国内的输油管线防盗检测系统的基础上，结合GPRS传输优势，提出了一种基于GPRS传输的新型输油管线监控系统。

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therefore, study on high-performance automotive anti-theft alarm system has an important application value.

因此，研制出高性能的汽车防盗报警系统具有重要的应用价值。

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