The two oscillator circuits underneath are ideal for applying crystal oscillators in series or parallel manner: Modeling of nonlinear micromechanical resonators as well as their simulation While using the harmonic‐harmony process PDF 中原子或分子的排列具有三维空间的周期性，隔一定的距离重复出现，这种周期性规律是 Far more precise sets of the 1st and next get temperature coefficients are... https://www.hxcrystals.com/seokeywords/bulk-crystal-oscillator.html