查询词典 Polack

"Work " the number cannot cut statistic to occupy circulation truly very big " speak bluntly " weekly report, every 3 grown Polack, one person is in " work ", the profession that they pursue is very extensive, have those who do bldg.

&打黑工&的人数无法确切统计据发行量很大的《直言》周刊报道，每3名成年的波兰人，就有一人在&打黑工&，他们所从事的职业十分广泛，有搞建筑业的，有推销产品的，有散发广告的，有销售图书的……月工资从几十美元到几百美元不等。

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。