1) flood hazard frequency
水灾频率
2) Changing of drought years
旱灾频率
3) flooding frequency
洪灾频率
4) catastrophe frequency
巨灾频率
5) Change the frequency of disasters
灾害频率变化
6) frequency of water inrush
突水频率
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