periodicit周期性, 周波periodicadj.周期的；定期的；间歇的；完句的periodic procedure期末会计手续periodicity factor周期因子periodic budgeting[经] 定期的预算编制periodic inequality周期不等式periodic commentary期刊评述periodic regulation定期调整periodic accounting期间会计核算periodic scheduling周期性调度periodic convulsion阵挛periodic B-spline周期B样条