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This study discussed the important role of laboratory animal science and technic its facing problem.

它的发展水平是衡量现代生殖医学研究水平和质量的一个重要的标志。

Key Laboratory of Animal Nutrition and Feed Science, Wuhan 430023

动物营养与饲料科学湖北省重点实验室，湖北武汉 430023

The State Key Laboratory of Animal Nutrition, Institute of Animal Science, CAAS, Beijing 100193, China

中国农业科学院畜牧研究所动物营养学国家重点实验室，北京100193

Department of Laboratory Animal Science, Capital University of Medical Sciences,Beijing 100054,China

军事医学科学院实验动物中心，北京 100071；2。首都医科大学实验动物科学部，北京 100054

State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China

动物营养学国家重点实验室中国农业大学动物科技学院，北京 100193

Institute of Animal Science, CAAS,State Key Laboratory of Animal Nutrition, Beijing 100094, China

中国农业科学院北京畜牧兽医研究所，国家动物营养与代谢实验室，北京 100094

1Institute of Laboratory Animal Science, CAMS and PUMC, Beijing 100021, China

1中国医学科学院北京协和医学院实验动物研究所，北京 100021

"Science and technology is the first productivity " with " laborer is chief factor " it is reconcilable.

"科学技术是第一生产力"同"劳动者是首要的因素"是不矛盾的。

Tool of labour force, labor and the on any account of level of science and technology that subject of labor has, decided the discretion of productivity level.

劳动力、劳动工具与劳动对象所拥有的科学技术水平高低，决定了生产力水平的高低。

Through the deepened cognition of production labor,scientific labor and managerial labor,the labour conception is prosperous and the ranges of production labor are enlarged,and the ideas that science and technology and management are not only productive labor but also play a great ro...

通过深化对生产劳动、科技劳动和经济管理劳动的认识，有利于丰富劳动概念的内涵，拓展生产劳动的范围，明确科技和经营管理劳动不仅是生产性劳动，而且在价值和社会财富的创造中发挥着巨大的作用。

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。