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区域旱情等级
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Classification of Regional Drought Severity
《区域旱情等级》
中国规范全国、省（自治区、直辖市）、地（市、州、盟）和县（区、旗）四级行政区旱情评估工作的国家标准。
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on-orbit telemedicine
on-orbit wastewater treatment technique
on-orbit water management system
On Origin of Regular Scripts
Ono Seiichiro
Ono Takash
O-notation
Ono Tozaburo
On Painting
On Parting
On Penetrating the Transformations Based on the Charts of the Book of Changes
On Plague Diseases
On Poetic Forms and Patterns
On Poetics
On Poetry
On Poland
On Policy
On Political Factions
On Practice
on-premise standby equipment
ONR
On Records Movement
on resistance
On Resolving Doubts and Indicating the Ways
On Rural Surveys
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