DESIGN: Cluster sampling and cross-sectional investigation.
设计：整群抽样，横断面调查。
DESIGN: Randomized cluster sampling, cross-sectional study.
设计：随机整群抽样，横断面调查。
Method cluster sampling and cross sectional study.
方法整群抽样，横断面调查。
Objective Under design of cross sectional study and randomly sampling, a survey was conducted in 6 counties of Ningxia province in China on the status of nutrition of children under 3 years old.
为了解宁夏农村3岁以下儿童的营养状况，对宁夏6县进行了随机抽样横断面调查。
With a cross - sectional study design, 143 participants were recruited by purposive sampling.
采用横断式研究设计，经立意取样，招募143位高雄县美浓镇越南籍妇女参与本研究。
Methods in 1999, a cross-sectional study was carried out in a natural population of Beijing, using stratified-random sampling method.
方法1999年在北京市自然人群中采用分层随机抽样的方法进行横断面调查。
DESIGN: Randomized cluster sampling and cross-sectional study.
设计：随机整群抽样，横断面调查。
MethodThe study was a cross sectional survey, sampling the whole group aged 80 years and above, who live in Jiajian country, Bama County.
方法截断面调查，整群抽取巴马县甲篆乡80岁以上老人。
Through needle valve can change the tee cross-sectional of low-flow adapter, thus changing the sample flow, and thus able to meet the requirements of toxicology sampling norms.
通过在一定的范围内人为改变低流量适配器三通旁支管的断面面积来改变采样流量，从而满足对酯类、腈类等气体采样规范的要求。
Through needle valve can change the tee cross-sectional of low-flow adapter, thus changing the sample flow, and thus able to meet the requirements of toxicology sampling norms.
通过在一定的范围内人为改变低流量适配器三通旁支管的断面面积来改变采样流量，从而满足对酯类、腈类等气体采样规范的要求。
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