関連ワード:  what is the purpose of a controlled variable    what is the purpose of a controlled variable in an experiment    what is the purpose of a control variable in research    what is the role of a controlled variable in an experiment    what is the purpose of having a controlled variable in an experiment    what is the role of a control variable    what is the function of a control variable    what is the use of a control variable    what is the purpose of using a control variable in research    what is the purpose of controlled variables in an investigation  
結果 : what is the purpose of a controlled variable