Crystal oscillators are loosely divided from the frequency they perform at and whether or not they are elementary oscillators—work for the frequency marked around the can or at even multiples of that (overtone oscillators). Modeling of nonlinear micromechanical resonators and their simulation Together with the harmonic‐equilibrium technique 中原子或分子的排列具有三维空间的周期性，隔一... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html