A.TABSURF B.ROTATE C.RULESURF D.REVSURF
A.相同方向的端點(diǎn) B.正反方向的端點(diǎn) C.任意取端點(diǎn) D.實(shí)體的中點(diǎn)
A.VIEW B.DVIEW C.VPOINT D.PLAN