A、<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: Simsun; mso-bidi-font-family: 宋体; mso-hansi-font-family: Simsun">观察法</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: " times="" new="" roman","serif";="" mso-font-kerning:="" 1.0pt;="" mso-ansi-language:="" en-us;="" mso-fareast-language:="" zh-cn;="" mso-bidi-language:="" ar-sa;="" mso-bidi-font-family:="" 宋
B、<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: Simsun; mso-bidi-font-family: 宋体; mso-hansi-font-family: Simsun">个案法</span><span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: " times="" new="" roman","serif";="" mso-font-kerning:="" 1.0pt;="" mso-ansi-language:="" en-us;="" mso-fareast-language:="" zh-cn;="" mso-bidi-language:="" ar-sa;="" mso-bidi-font-family:="" 宋
C、<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: Simsun; mso-bidi-font-family: 宋体; mso-hansi-font-family: Simsun">调查法</span>
D、<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: Simsun; mso-bidi-font-family: 宋体; mso-hansi-font-family: Simsun">实验法</span>