PDabbr.螺纹中径(=pitch diameter)abbr.邮区(=postal district)Pd catalyzer钯催化剂Pd-Fe ahoy钯铁合金PDGF recepter血小板衍化生长因子受体Pd-Ag alloy钯-银合金Pd-Ir alloy钯-铱合金Pd-Cu alloy钯铜合金pdythene film聚氯乙稀膜PD rat models帕金森病大鼠模型Pd -Co/C氧还原反应PD controller比例微分控制器