Objective Explore the seasonality and trend of hepatitis a in Liaoning drought area under natural condition.
目的探索辽宁省干旱地区自然条件下甲型肝炎季节性和趋势性发病特征。
As a most drought type in temperate steppe, the desert steppe in Inner Mongolia is a district with harshest natural condition, lowest productivity and weakest ecosystem in steppe districts.
内蒙古荒漠草原是温带草原中最干旱的一个类型，为草原区自然条件最严酷、草场生产力最低、生态系统最脆弱的一个地区。
This paper analysed the condition and cause of drought of orange garden in mountain land and proposed a set of drought resistant culture techniques suitable for orange garden in mountain land.
分析了山地柑桔旱害状况和旱害原因，提出了一套适用于山地桔园的抗旱栽培技术。
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