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X1,2,2(11,400084;21,400013):,,,:;;:TF12:B:1006-0316(2001)06-0058-02,,,,,,,,,[1],,,,[2]1(),,,1()r,()1a,2,x,()zOxyz(),O1XYZ21,Oxyz,ÁKO1Z,O1ZO1(a,0,0)ÁK=(0,sin,cos),()OxyzO1XYZX=x-aY=ycos-zsinZ=ysin+zcos(1)(),S(),M(x,y,z),2,OMx,x=rcosy=rsinz=z(2),()M(x,852001286X:2001-01-20©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.)n=(x,y,0),nSM,M,,O1MK,n1=O1MK(3)K=(0,sin,cos),O1M=(x-a,y,z),(3)n1=yzsincos,zx-acos0,x-ay0sin(4),n,nn1,3,n1n=0(5)(5),n=(x,y,0),aycos-zxsin=0tg=ztgPa(6)cos=aa2+z2tg2sin=ztga2+z2tg2cos=-aa2+z2tg2sin=-ztga2+z2tg2,(6),,(2),x=raa2+z2tg2y=rztga2+z2tg2z=z(7)2()OxyzO1XYZ(1),(7)(1)X=(r-a2+z2tg2)aa2+z2tg2Y=zsin(r-a2+z2tg2)a2+z2tg2Z=zcos+rzsintga2+z2tg2(8)Z=zcos+rzsintga2+z2tg2R=X2+Y2=a2+z2tg21-ra2+z2tg2(9)(9),r,1-ra2+z2tg2()34r=10,a=70,=30r=5,a=65,=303()4,,()r()a,,ª10ª20()4();():[1],.().()[M].:,1997.11.[2].[M].:,1995.12.952001286©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.