单项选择题
我国人口地理中爱辉—腾冲线的提出者是( )
A.张相文
B.翁文灏
C.胡焕庸
D.竺可桢
我国人口地理中爱辉—腾冲线的提出者是( )
A.张相文
B.翁文灏
C.胡焕庸
D.竺可桢
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多项选择题
Which are the methods of interview investigation? ()
Which are the methods of interview investigation? ()
A.Face-to-face interview
B.Questionnaire investigation
C.Informal discussion
D.Telephone interview