在“编辑样条曲线”的参数里，（）表示的是曲线。

1.Bzier曲线与B样条曲线有何联系？Bezier曲线在何种情况下可以变为B样条曲线？ 2.实体模型的计算机内部表示方法主要有哪些？各有何特点？ 3.实体模型的建模方法有哪些？ 4.以下IGES文件是由哪个软件生成？共表示了几个几何元素？分别是什么？写出其中表示曲线参数的数值。 IGES file generated by CAXA EB 2001 for windows S 1 1H,,1H;,,38HC:\Users\ylcai\Desktop\工程图文档1.igs,38HCAXA Electronic BoG 1 ard 2001 for Windows,3H1.0,32,38,6,308,15,34HC:\Users\ylcai\Desktop\工程G 2 图文档1,1.,2,2HMM,20000,200.,13H200401.092918,0.0001,226.8381999623,,,9,G 3 0,13H200401.092918; G 4 110 1 0 1 0 0 0 000000000D 1 110 70 8 1 0 D 2 100 2 0 1 0 0 0 000000000D 3 100 70 8 2 0 D 4 126 4 0 1 0 0 0 000000000D 5 126 70 8 6 0 D 6 110,-204.0960591133,-31.2727832512,0.0,0.0,0.0,0.0; 1P 1 100,0.0,-204.0960591133,-31.2727832512,-181.3539182643, 3P 2 -31.2727832512,-181.3539182643,-31.2727832512; 3P 3 126,6,3,0,0,1,0,0.0,0.0,0.0,0.0,0.4323454846,0.6258006671, 5P 4 0.8786478802,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,-204.0960591133, 5P 5 -31.2727832512,0.0,-183.4355638043,-4.2719744137,0.0, 5P 6 -129.5976494183,46.3559296776,0.0,-71.0802724517,-22.5151148477, 5P 7 0.0,-25.4797993785,40.2730869379,0.0,-4.4065542544,8.4644908599, 5P 8 0.0,0.0,0.0,0.0,0.0,1.,0.0,0.0,1.; 5P 9 S 1G 4D 6P 9 T 1

A. Connect

B. Fillet

C. MakeFirst

D. Revert

A、延伸

B、移动

C、修剪

D、镜像

A、1

B、多

C、无数

D、所有

A. 节点

B. 分段

C. 样条线

D. 线段

A、公差

B、闭合

C、端点

D、圆心

A、1

B、2

C、3

D、多