1) Drought equivalent
干旱频率
2) frequency analysis of drought
干旱频率分析
3) drought frequency
干旱频数
4) arid change rate
干旱变率
5) Requency of Drought and Flood
旱涝频率
6) Changing of drought years
旱灾频率
补充资料：频率计量(见时间频率计量)
频率计量(见时间频率计量)
frequency metrology: see time and frequency metrology
口n IQ liliang顷率频率计皿(f比quency metrolo盯) 计t。见时闰
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条