全液压牙轮钻机在钻进时,对钻杆进行扭矩限制,对整机的安全性具有重要作用.通过对钻杆负载特性分析和回转系统理论研究,设计了以溢......

An effective and accurate method was developed for the extraction of astaxanthin from Laminariajaponica with subsequent ......