18. 若phpq3KWsL=2x•3y,則 x + y = ?
(A)phpLieBGU
(B)phpeQ1CvL
(C)phpNH8yCr 
(D)php8fT6Gl

答案:登入後查看
統計: A(7), B(8), C(5), D(26), E(0) #1585183