A.單個(gè)銷(xiāo)售人員對(duì)單個(gè)顧客 B.單個(gè)銷(xiāo)售人員對(duì)一組顧客 C.銷(xiāo)售小組對(duì)一組顧客 D.銷(xiāo)售會(huì)議