采取抽样调查法和侵蚀断面测量法，对陕西北部山丘区公路开挖边坡侵蚀进行了定量分析。
The erosion of cutting-slope of highway in north Shaanxi Province is investigated and evaluated by measuring the erosion depth on slope surface through 43 sampling sites.
研究小组采取面对面访谈的方式，对全国1万余名年龄在13至18岁之间（平均年龄15岁）有代表性的青少年进行了抽样调查。
The design consisted of face-to-face interviews of a nationally representative sample of more than 10,000 adolescents aged 13 to 18, with an average age of 15.
方法：采取整群随机抽样方法，对本市农村地区老年人群进行结核病流行病学抽样调查。
Methods: Epidemiological survey of tuberculosis was conducted by cluster random sampling in the elderly in rural area.
由于该抽样调查采取的是分层抽样，因此相应地用分层抽样下的样本轮换研究。
As the sampling survey is stratified sampling, so the research of the sample rotation is under the stratified sampling.
由于该抽样调查采取的是分层抽样，因此相应地用分层抽样下的样本轮换研究。
As the sampling survey is stratified sampling, so the research of the sample rotation is under the stratified sampling.
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