This new legitimacy and you will precision of the survey was indeed tested and you can fixed in line with the pre-try
This new legitimacy and you will precision of the survey was indeed tested and you can fixed in line with the pre-try Into , this research chosen a couple kinds from inside the Chengdu Shishi middle school and you may Jinniu middle school respectively, distributed 300 forms, retrieved 278 forms, deducted 12 incorrect forms and you [...]