The questionnaires were given to rafters, in Siaokuluan and Lao-nong River, and non-random sampling method is used. 292 effective questionnaires were collected by Siaokuluan River, 325 by Lao-nong River.
详情正文
登录后查看完整内容
使用 DeepEvidence / 梅斯账号登录，新用户可在登录页面注册。
登录 / 注册登录成功后将返回当前页面，继续浏览。