periodaten.高碘酸盐
periodn.一段时间;周期;时期;课时;学时;句号;月经
period-time charter定期租赁合同
periodogram detection周期图检测
Periodontic procedure牙周操作
period of adjournment休会期
period rounding error周期舍入误差
period of commutation换向周期
period of destruction破坏期
periodontal membranes[医] 牙周膜
period of oscillation振荡周期,振动周期,振荡的周期
period of illumination光周期