vaild period 有效期...identity period 等同周期...period n.时期,节段,节,句点,学时...accounting period convention 会计期惯例...accounting period 会计期会计期...accounting period assumption 会计期假定...absolute refractory period 绝对不应期...carbon period 石炭纪...quarantine period 检疫期,留验期...acceleration period 加速期...waiting period 等待期...qualifying period 试用期...half-period 半周...lag period 迟滞期(细菌培养)...half foam life period 泡沫半衰期...accounting period principle 会计期原则...idle period 空转期间,空档期间...achromic period 消色时间...accounting reference period 帐目查询期...warranty period 保证期限,保证期间...action period 作用期...
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