overall cost

There is a great development in unit technology and assembly design/manufacture of high energy battery,drive electric motor ,control system and management system.

本文对近年来电动汽车的整车、各个主要关键总成和单元技术装备的进展基本情况进行介

The consecutive life of the positive displacement motor depends on its main shaft bearing assembly,but the assembly is a weak point.

螺杆钻具主轴轴承总成是螺杆钻具的薄弱环节,对整个螺杆钻具的使用寿命起决定性作用。

It is composed of drill pipe joint, a packing assembly, valve assembly and a pipe guiding assembly, where the packing assembly is used to seal the casing end as casing stuck is caused in casing running and charge the pressurized drilling .

该装置主要由钻杆接头、胶封总成、阀总成、引导管总成4部分组成。