Crystal oscillators are loosely divided because of the frequency they get the job done at and whether or not they are essential oscillators—do the job at the frequency marked around the can or at even multiples of that (overtone oscillators). 例如：随着人工智能的不断发展，机器学习这门技术也越来越重要，很多人都开启了学习机器学习，本文就介绍了机器学习的基础内容�?提示：以下是本篇文章正文... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html