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It is a required course.

是一门必修的课程。

Crisis management is a required course for enterprises, building crisis management information system is business of the moment.

企业危机管理是企业的必修课，构建危机管理信息系统是企业的当务之急。

Translation is required as a compulsory course for English majors in many colleges and universities in China.

翻译课是大学英语专业开设的一门翻译理论和实践相结合的必修课。

College English, an integral part of higher learning, is a required basic course for undergraduate students.

大学英语教学是高等教育的一个有机组成部分，大学英语课程是大学生的一门必修的基础课程。

Your biography is almost a required course.

你的自传几乎变成了必修课了。

Interpersonal relations is a required course in every college in China.

人际关系在中国是每个大学的必修课。

It is one of the core courses in life science as well as a required basic course of modern medical science.

医学细胞生物学是一门生命科学的核心课程之一，是现代医学教育的必修专业基础课。

Setbacks, is a required course in life.

挫折，是人生的必修课。

Ethics is not a required course at the school, but it is an oversubscribed elective.

伦理学并不是学校的必修课，但却是一门选修人数极高的课程。

And mouth is a required course for every investor.

和嘴是每个投资者的必修课。

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。