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<html xmlns:v="urn:schemas-microsoft-com:vml"xmlns:o="urn:schemas-microsoft-com:office:office"xmlns:w="urn:schemas-microsoft-com:office:word"xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=gb2312"><meta name=ProgId content=Word.Document><meta name=Generator content="Microsoft Word 11"><meta name=Originator content="Microsoft Word 11"><link rel=File-List href="da08.files/filelist.xml"><link rel=Edit-Time-Data href="da08.files/editdata.mso"><link rel=OLE-Object-Data href="da08.files/oledata.mso"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}o\:* {behavior:url(#default#VML);}w\:* {behavior:url(#default#VML);}.shape {behavior:url(#default#VML);}</style><![endif]--><title>第8章</title><!--[if gte mso 9]><xml> <o:DocumentProperties> <o:Author>chen</o:Author> <o:LastAuthor>Legend User</o:LastAuthor> <o:Revision>3</o:Revision> <o:TotalTime>42</o:TotalTime> <o:Created>2004-06-27T07:48:00Z</o:Created> <o:LastSaved>2004-06-27T07:48:00Z</o:LastSaved> <o:Pages>4</o:Pages> <o:Words>320</o:Words> <o:Characters>1829</o:Characters> <o:Company>ytu</o:Company> <o:Lines>15</o:Lines> <o:Paragraphs>4</o:Paragraphs> <o:CharactersWithSpaces>2145</o:CharactersWithSpaces> <o:Version>11.5606</o:Version> </o:DocumentProperties></xml><![endif]--><!--[if gte mso 9]><xml> <w:WordDocument> <w:PunctuationKerning/> <w:DrawingGridVerticalSpacing>7.8 磅</w:DrawingGridVerticalSpacing> <w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery> <w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery> <w:ValidateAgainstSchemas/> <w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <w:Compatibility> <w:SpaceForUL/> <w:BalanceSingleByteDoubleByteWidth/> <w:DoNotLeaveBackslashAlone/> <w:ULTrailSpace/> <w:DoNotExpandShiftReturn/> <w:AdjustLineHeightInTable/> <w:SelectEntireFieldWithStartOrEnd/> <w:UseWord2002TableStyleRules/> <w:UseFELayout/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> </w:WordDocument></xml><![endif]--><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles></xml><![endif]--><style><!-- /* Font Definitions */ @font-face {font-family:宋体; 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