A、((JohnMayer)wnAU)and((electroniccommercE.wnTI) B、((JohnMayer)wnAU)and((electroniccommercE.wnAB. C、((JohnMayer)wnAF.and((electroniccommercE.wnTI) D、((JohnMayer)wnAF.and((electroniccommercE.wnAB.
A、超文本檢索 B、超媒體檢索 C、標(biāo)題檢索 D、全文檢索