实验研究 调查研究 行动研究 非介入性研究（unobtrusive measures） 38 下列何者议题适合采用田野研究方法？
基于12个网页-相关网页
非介入性（unobtrusive measures） 的研究方式，收集有??
基于1个网页-相关网页
Kelly, the husband of former Rep. Gabby Giffords and an outspoken advocate for new gun control measures, had in recent interviews said he was buying the rifle to showcase what he said are unobtrusive background checks.
CNN: Gun store nixes Mark Kelly's AR-15 purchase
应用推荐
模块上移
模块下移
不移动