【Key words】 flood and drought disasters； genesis； time space distributions； evolutional tendency； Hunan province；
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The tube inlet throttle has great influence on the time space distributions of the gas velocity and pressure.
身管入口节流对燃气流速和压力的时空分布产生重要影响。
By the simulation of discharge evolution in a discharge cell of SSAC-PDP, the space distributions of potential, electrons and ions density with time in a discharge cell are presented.
通过模拟单基板彩色AC - PD P放电单元的工作情形，给出了单元内电位、电子和离子浓度的分布情况。
The space-time distributions of large, super-large deposits show clusterity, asymmetry and discontinuity.
大型、超大型矿床在空间上和地质时间上分布既有趋群性，又有不均匀性和不连续性。
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