periodic law周期律,门捷列夫定律periodicadj.周期的；定期的；间歇的；完句的periodic feelings of anxiety.周期性焦虑。periodic predator-prey system周期捕食与被捕食系统periodic electrostatic focusing周期静电聚焦Periodic and Seasonal Variation周期与季节变化periodic prosthetic follow-up定期假肢随访periodic complementary sequence同期互补序列periodic permanent magnet field周期永磁聚焦系统periodic acid-schiff reaction高碘酸席夫反应periodic acid-Schiff staining希氏高碘酸染色法periodic dumping time-sharing周期性转储分时