英汉例句

• design:a stratified random cluster sampling investigation.

  设计：分层整群抽样调查。

• methods: by using questionnaires with multistage stratified random cluster sampling method, 726 valid questionnaires of 800 were backed from the university students in 4 universities in dalian city.

  对象与方法：研究对象采取分层整群随机抽样的方法，在大连市4所高校大一、大四年级学生中发放问卷800份，收回有效问卷726份。

• methods: stratified random cluster sampling method was used to determine the survey sample.

  方法：以分层随机整群抽样的方法，确定调查样本。

• methods stratified random cluster sampling was applied to conduct the investigation using pre-designed and tested questionnaire.

  方法采用分层随机整群抽样方法，对疟史进行问卷调查。

• methods stratified random cluster sampling was used, 9 township hospitals were randomly selected from beihu district, suxian district and guiyang county of chenzhou.

  方法采用分层整群随机抽样的方法，在郴州市随机抽取北湖区、苏仙区和桂阳县的9所乡镇卫生院作为调查现场。

• method stratified random cluster sampling was adopted, 3,553 students from 6 countryside middle schools were assessed by anonymous questionnaires.

  方法采用分层随机整群抽样，选择6所农村中学的3 553名学生进行无记名问卷调查。

• methods a adolescent risk behavior questionnaire was conducted with stratified random cluster sampling among about 8 100 students from 8 high schools and 8 primary schools in guangzhou.

  方法采用分层整群抽样方法分别抽取广州市8所小学和8所中学约8100名学生进行无记名问卷调查。

• the normal value range of indicators about accident proneness were detected according to epidemiological survey results using stratified random cluster sampling in 5 cities.

  在5个城市作整群分层随机抽样调查确定与事故倾性有关指标的正常值范围。

• methods two-stage stratified random cluster sampling was used to select one large city(shenzhen), one moderate city(zhuhai), one 1st class rural county(xinxing), one 2nd class rural county(lianping).

  方法采用二阶段分层随机整群抽样方法随机抽取大城市1个市（深圳）、中小城市1个市（珠海）、1类农村1个县（新兴），2类农村1个县（连平）。

• methods residents aged 55 or over were selected by stratified random cluster sampling from 19 districts, cities, and counties of chengdu area in sichuan province.

  方法采用分层随机整群抽样方法从成都市所辖19个区、县（市）抽取样本，调查分为筛查、复查诊断两个阶段。