Systematic community investigation into street trees in Shenyang was carried out using typical sampling method.
采取典型抽样的方法对沈阳市行道树进行了全面的群落调查。
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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