periodaten.高碘酸盐periodn.一段时间；周期；时期；课时；学时；句号；月经period of apprenticeship见习期period of trade economuy交易经济时代Periodontitis/am ther牙周炎／针灸疗法Period Evaluation Record定期评定记录period of rehabilitation康复期period of immobilization固定期period-effective index时效索引periodontal therapentics牙周病治疗学period of operation time运行时段Period of changing water换水周期