periodicles期刊periodicadj.周期的；定期的；间歇的；完句的periodic correlation周期相关periodic payment pla定期定额投资计划periodic compounding定时复合Periodicity analysis周期分析periodic fluctuations[经] 周期性波动periodic write-offs[经] 定期转销数periodicity condition周期性条件periodic optimization周期优化periodic coefficients周期系数periodic verification周期性检定