Method To carry out the comprehensive investigation on the medical quality of 24 different level hospitals in this area, which selected by stratifying sampling.
方法：采用分层抽样调查方法，对本区域24所不同级别医院的医疗质量进行全面调查。
This paper studied the density and the condation of Pseudopeziza medicaginis (Clib) Sacc with the method of sampling, investigation and measurement in definite spots and times.
采用定点定期采样、调查、测定的方法，研究了紫苜蓿褐斑病的发生危害的程度及发病条件。
Methods Systematic sampling method was used in field Oncomelania investigation, and laboratory and field simulating drowning methods were also performed to observe survival of Oncomelania.
方法应用系统抽样法进行现场查螺，现场和实验室模拟水淹实验观察钉螺存活情况。
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