A.1B.2C.3D.无限
A.LinB.PTPC.圆弧运动D.相对点到点运动
A.(A1,A2,A3,A,B,C)B.(X,Y,Z,A,B,C)C.(A1,A2,A3,A4,A5,A6)D.(X,Y,Z,A4,A5,A6)