比50千米多20%的数是 请选择ABC(U+f:G1D.{:V7e,w3q4d/c-j2Y'w:\+k/o:B;n
A.10千米-j2Y'w:\+k/o:B;n
B.40千米-j2Y'w:\+k/o:B;n
C.60千米-j2Y'w:\+k/o:B;n