需要通过验证才能下载！希望大家多多合作！否则不能下载！请谅解！

				% 6-4-3.ty
				\documentclass{article}
				\input tdw
				\begin{document}
				\setlength{\unitlength}{1mm}
				\begin{center}
				\begin{picture}(44,44)(-20,-20)
				\put(0,0){\draw0,0,{width(.4),
				circle(0,0,20),
				threed(20.7,70.3),
				trace(-69.3*pi/180,110.7*pi/180,20cos(t),20sin(t),0),
				trace(-0.366,pi-0.366,20sin(t),0,20cos(t)),
				trace(-0.792,pi-0.792,0,20sin(t),20cos(t)),
				line(20,0,0,28,0,0),
				line(0,20,0,0,24,0),
				line(0,0,20,0,0,24),
				arrowheadd(28,0,0,1,0,0,2,10),
				arrowheadd(0,24,0,0,1,0,2,10),
				arrowheadd(0,0,24,0,0,1,2,10),
				write(29,0,0)[rt]{$x$},
				write(0,25,0)[l]{$y$},
				write(0,0,25)[b]{$z$},
				write(0,0,-0.5)[lt]{$O$},
				dotted(6,7),width(.2),
				trace(110.7*pi/180,290.7*pi/180,20cos(t),20sin(t),0),
				trace(2pi-0.366,pi-0.366,20sin(t),0,20cos(t)),
				trace(2pi-0.792,pi-0.792,0,20sin(t),20cos(t)),
				line(-20,0,0,20,0,0),
				line(0,-20,0,0,20,0),
				line(0,0,-20,0,0,20)}}
				\end{picture}
				\qquad
				\begin{picture}(44,44)(-20,-20)
				\put(0,0){\draw0,0,{width(.4),
				circle(0,0,20),
				threed(45,45),
				trace(-69.3*pi/180,110.7*pi/180,20cos(t),20sin(t),0),
				trace(-0.366,pi-0.366,20sin(t),0,20cos(t)),
				trace(-0.792,pi-0.792,0,20sin(t),20cos(t)),
				line(20,0,0,28,0,0),
				line(0,20,0,0,24,0),
				line(0,0,20,0,0,24),
				arrowheadd(28,0,0,1,0,0,2,10),
				arrowheadd(0,24,0,0,1,0,2,10),
				arrowheadd(0,0,24,0,0,1,2,10),
				write(29,0,0)[rt]{$x$},
				write(0,25,0)[l]{$y$},
				write(0,0,25)[b]{$z$},
				write(0,0,-0.5)[lt]{$O$},
				dotted(6,7),width(.2),
				trace(110.7*pi/180,290.7*pi/180,20cos(t),20sin(t),0),
				trace(2pi-0.366,pi-0.366,20sin(t),0,20cos(t)),
				trace(2pi-0.792,pi-0.792,0,20sin(t),20cos(t)),
				line(-20,0,0,20,0,0),
				line(0,-20,0,0,20,0),
				line(0,0,-20,0,0,20)}}
				\end{picture}
				\end{center}
				\end{document}