Drawing part : it has adopted pneumatic gripping and the famous brand frequency control systems which enable the stable drawing of the pipes 牵引部分:采用气动夹紧,品牌变频调速,可实现管材的稳定牵引。
Firstly , this paper describes the development and status of crystal resonators . its advantages as a frequency control component are presented 本文先叙述了晶体谐振器的发展及其现状,晶体作为频稳器件的优点。