periodaten.高碘酸盐
periodn.一段时间;周期;时期;课时;学时;句号;月经
period delay mechanism延期机构
Periodontal infections牙周感染
period of project life项目寿命期
period of cancellation[经] 注销合同的通知期
periodontal pus pocket牙周脓袋
period of amortization摊销期限
period od distribution有价证券推销期
period of dust removal清灰周期
period of optical cycle光学循环周期
period of magnetization磁化强度的周期