Earthquake occurrence period

Forecast formula of occurrence period

High occurrence period

Meteorological occurrence period distance

Carboniferous Period—Permian Period

Demand charge shift from the on-peak period to the off-peak period

middle_period and last_period state_mines

Paleogeng Period-Neogene Period

period shut-down (period trip)

period-to-period value changes

Spring and Autumn period and Warring States period

the Spring and Autumn Period and the Period of War

3D Co-occurrence matrix

501 ore occurence

a common occurrence

abnormal occurrence

Accident (Crash) Occurrence

aesthetic occurrence

air pollution occurrence