A.(5土1)萬km B.(4土1)萬km C.(3土1)萬km D.不少于2萬km
A.(10~12)萬km B.(8~10)萬km C.(5~8)萬km D.(4~6)萬km
A.(23~30)萬km B.(30~35)萬km C.(35~40)萬km D.(40~50)萬km