灾害防治 Disaster prevention ; disaster structures treatment ; hazard prevention and treatment ; hazards control 时间灾害 time hazard .
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Introduces the leaf peach shrinkage of hazard symptom, pathogen infect circulation, features, and prevention and treatment.
介绍了桃树缩叶病的危害症状、病原特征、侵染循环、发生因素以及防治方法。
Objective to study the present status of fluorine hazard in aluminum2smelting work and to provide a scientific basis for the prevention and treatment of industrial fluorosis.
目的了解炼铝作业氟的危害状况，为工业性氟病的防治提供依据。
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