introdction meaning in Chinese

引言

A general introdction to action research for professional development
科学发展观理论研究述评
Let ’ s read the brief introdction of the writer about the text first
让我们先看看这篇课文的作者简介吧。
Introdction in this part , the author discousses the disappearing and coming pack of underworld society crime in china , which has become a abstacle to the development of our vociety . thus , it is an important task of maintaining social stability to take stron measures against underworld society crime
导言，简述黑社会犯罪在我国的消亡与发展，说明黑社会犯罪已成为阻碍我国社会文明进步的绊脚石；打击黑社会犯罪，已成为我国目前稳定社会治安秩序的紧迫任务。
High pressure grinder brief introdction high pressure grinder . the machine is on purpose to grind the barite , h igh pressure grinder limestone , kaolinite , cerames , ahd slags , etc , below scale 9 . 3 of moh , shardness and 280 - odd sorts of non - inflammable and non - explosive stuff in the trades of mining , metallurgical industrial , chemical engineering and building material for high fine powder generation and processing
高压微粉磨主要适用于常规物料的研磨粉碎，如高岭土石灰石方解石滑石大理石重晶石石膏氧化铁红氧化铁绿氢氧化铝颜料膨润土陶土等湿度小于8 ，莫氏硬度在6级以下的非易燃易爆物料的超细粉加工。