Coastal erosion mainly has two types: coastal erosion phenomena of long period and tendency, and coastal erosion phenomena of very rough sea of short period.
指出我国海岸侵蚀主要有两种类型：长周期趋势性的海岸侵蚀和短周期的暴风浪侵蚀现象。
For short - circuit faults occurring in power systems, the behavior of shunt active power filter APF is analyzed. It is concluded that the overcurrent phenomena will happen during the fault period.
对并联型电力有源滤波器(APF)在电力系统发生各种短路故障时的行为进行了分析，得出了在系统发生故障期间APF会发生过流现象的结论。
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