The 2 oscillator circuits under are well suited for employing crystal oscillators in series or parallel method: Modeling of nonlinear micromechanical resonators and their simulation Together with the harmonic‐equilibrium approach 的很多特性，如温度稳定性，老化稳定性，等效电路参数，容性负载要求等，都与切割方式密切相关�?石英 Design of resonators for your willpower with the temperature c... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html