一根钢管,截去部分是剩下部分的1/4,剩下部分是原钢管长的请选择ABCD;m3k;K-R/U-z7e8s,_)K)I3c%。4x*`9G4i3o'y0C:B:k/W1n
A.754x*`9G4i3o'y0C:B:k/W1n
B.4004x*`9G4i3o'y0C:B:k/W1n
C.804x*`9G4i3o'y0C:B:k/W1n
D.254x*`9G4i3o'y0C:B:k/W1n