把1米长的绳子平均分成4份，每份占全长的请选择CBA0B,S/B/j1^2i*T0h-f;f1X2A'W2p(p+H6E9^5H)a(y
A． 1/52p(p+H6E9^5H)a(y
B． 1/42p(p+H6E9^5H)a(y
C．1/5米2p(p+H6E9^5H)a(y