通过对周期性变量最大等待时间的分析，给出判断扫描变量表有效性判据。
Finally, the validity criterion of the scan variable table built is given by analyzing the maximum waiting time.
所用的预测方法是倍周期性、静中动判据和地球物理灾害链。
The predicting methods used are multiplied periodicity, criterion of activity in quiescence and the geophysical disaster chain.
首次对广义离散系统的周期解的存在性进行研究，给出了广义离散系统周期解存在的判据。
The existence of periodic solution of singular discrete system is firstly stud - ied and theorem which periodic solutions of singular discrete system exist is given.
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