折线图7-绘制圆台

R=滑动条(0,5,0.01) 赋值(R,1) r=滑动条(0,5,0.01) 赋值(r,1) h=滑动条(0,5,0.01) 赋值(h,1) f(x)=折线图{0...3,{0,R,r,0}) g(x)=折线图{0...3,{0,0,h,h}) #底面 a=曲线((f(s);)+(0,0,g(s)),s,0,3,t,0,2pi) b=滑动条(0,3,0.01) 赋值(b,0) c=曲线(a(b,t),t,0,2pi)