A.差錯率≦1.5‰ B.差錯率≦1‰ C.差錯率≦0.5‰ D.差錯率≦0‰
A.投訴率≦3‰ B.投訴率≦2‰ C.投訴率≦1‰ D.投訴率≦0‰
A.收費差錯率<3‰ B.收費差錯率<2‰ C.收費差錯率<1‰ D.收費差錯率=0