A.不應(yīng),應(yīng) B.應(yīng),應(yīng) C.不應(yīng),不應(yīng) D.應(yīng),不應(yīng)
A.不應(yīng) B.應(yīng) C.嚴禁 D.必須
A.20,40 B.30,60 C.40,80 D.50,100