一条什么长4分米 请选择CBA:n3s*R3F.e;k-Y4t;b,E.D*D0s6y*]
A.直线;b,E.D*D0s6y*]
B.射线;b,E.D*D0s6y*]
C.线段;b,E.D*D0s6y*]