2．抽样方法主要采用开放性抽样（open sampling）的方法。研究对象的纳入没有严格的规则和标准，根据研究情况需要由研究者确定。
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Open-Tube Sampling 开管式取样
open sampling
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
But they have left open the question of whether sampling violates the constitution, something the Supreme Court may ultimately have to decide.
ECONOMIST: Sampling is wrong: official | The
He breaks the herbs and the sorrel to open the flavors and passed around a few flowers from the plant to give the audience a sampling of its intense aroma before handing out drinks.
FORBES: Barbados, The Rum Island
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