下列方法中，用于绘制3D曲面图的是（ ）。 A: plot() B: plot_wireframe() C: plot_surface() D: plot_trisurf()

一元函数图像常用的作图命令是（ ） A: plot B: roots C: mesh D: surface

______ is covered with heavy snow. A: The surface of earth B: The earth’s surface C: The earths’ surface D: The surface

_____ is covered with heavy snow. A: The earth’s surface B: The surface of earth C: The surface earth D: The earth surface

What is the name of the solid surface in the figure below?[img=360x664]1803bb9e6fc6d99.jpg[/img] A: circular cone surface B: Cone-shaped surface C: Cylindrical surface D: Columnar surface

For soft tooth surface gear transmission, the hardness of the tooth surface should be selected A: Pinion tooth surface hardnesslarge gear tooth surface hardness B: Pinion tooth surface hardness≤large gear tooth surface hardness

获得plot函数的帮助,不可以使用命令 A: help(plot) B: help.plot C: plot D: (plot)

plot函数绘制二维曲线，常用格式有： A: plot(x) B: plot(x, y) C: plot(x1, y1, x2, y2,…) D: plot(x, y, ‘s’)

The principles for machining sequence of each surface should be( )<br/>and perform rough machining before finish machining. A: perform datum surface machining before that of other surfaces B: perform main functional surface machining before less important surface machining C: perform plane surface machining before hole surface machining D: perform complex surface machining before simple surface machining

把两个曲面进行连接曲面的命令是？ A: attach surface B: detach surface C: rebuild surface D: open\close surface