查询词典 conservation

One important form of soil conservation is the use of windbreaks.

土壤保护的一个重要形式是防风林的使用。

They were engaged in the study of soil conservation.

他们在从事土壤保持的研究。）自考成绩查询

One important form of soil conservation is the use of windbreaks.

其中一种重要的土壤保持方式就是利用防风林。

One important form of soil conservation is the use of windbreaks.

一个重要的保护土地的方式就是防风林的使用。

One important form of soil conservation is the use of windbreaks.

其中一种重要的土壤保护方法就是种植防护林。

In China sci-tech development of soil and water conservation has a long history for about 100 years.

经过近百年的发展，具有中国特色的水土保持科学体系已经基本形成。

One important form of soil conservation is the use of windbreaks.

一个重要的土壤保持法是使用防风林。

The project shows positive impact on the work of water and soil conservation in China.

世行项目的顺利实施，对整个水土保持工作产生了积极的影响。

One important form of soil conservation is the use of windbreaks.

土壤保护的重要方法之一就是使用防风林。

One important form of soil conservation is the use of windbreaks.

土壤保护最重要的一种方式就是使用防风林。

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。