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style="LETTER-SPACING: -1pt; mso-fareast-font-family: 楷体_GB2312; mso-font-kerning: 5.0pt">19.gttacattatttattattatccgttatcgataattttttacctcttttttcgctgagtttttattcttactttttttcttctttatataggatctcatttaatatcttaa<O:P>
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<P align=left class=MsoPlainText style="TEXT-ALIGN: left"><SPAN lang=EN-US
style="LETTER-SPACING: -1pt; mso-fareast-font-family: 楷体_GB2312; mso-font-kerning: 5.0pt">20.gtatttaactctctttactttttttttcactctctacattttcatcttctaaaactgtttgatttaaacttttgtttctttaaggattttttttacttatcctctgttat<O:P>
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<P class=MsoNormal style="mso-outline-level: 1"><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312"> <O:P> </O:P></SPAN></B></P>
<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">21.tttagctcagtccagctagctagtttacaatttcgacaccagtttcgcaccatcttaaatttcgatccgtaccgtaatttagcttagatttggatttaaaggatttagattga<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">22.tttagtacagtagctcagtccaagaacgatgtttaccgtaacgtqacgtaccgtacgctaccgttaccggattccggaaagccgattaaggaccgatcgaaaggg
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">23.cgggcggatttaggccgacggggacccgggattcgggacccgaggaaattcccggattaaggtttagcttcccgggatttagggcccggatggctgggaccc24.tttagctagctactttagctatttttagtagctagccagcctttaaggctagctttagctagcattgttctttattgggacccaagttcgacttttacgatttagttttgaccgt<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">25.gaccaaaggtgggctttagggacccgatgctttagtcgcagctggaccagttccccagggtattaggcaaaagctgacgggcaattgcaatttaggcttaggcca<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">26.gatttactttagcatttttagctgacgttagcaagcattagctttagccaatttcgcatttgccagtttcgcagctcagttttaacgcgggatctttagcttcaagctttttac
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">27.ggattcggatttacccggggattggcggaacgggacctttaggtcgggacccattaggagtaaatgccaaaggacgctggtttagccagtccgttaaggcttag<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">28.tccttagatttcagttactatatttgacttacagtctttgagatttcccttacgattttgacttaaaatttagacgttagggcttatcagttatggattaatttagcttattttcga<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">29.ggccaattccggtaggaaggtgatggcccgggggttcccgggaggatttaggctgacgggccggccatttcggtttagggagggccgggacgcgttagggc30.cgctaagcagctcaagctcagtcagtcacgtttgccaagtcagtaatttgccaaagttaaccgttagctgacgctgaacgctaaacagtattagctgatgactcgta<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">31.ttaaggacttaggctttagcagttactttagtttagttccaagctacgtttacgggaccagatgctagctagcaatttattatccgtattaggcttaccgtaggtttagcgt32.gctaccgggcagtctttaacgtagctaccgtttagtttgggcccagccttgcggtgtttcggattaaattcgttgtcagtcgctctrtgggtttagtcattcccaaaagg<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">33.cagttagctgaatcgtttagccatttgacgtaaacatgattttacgtacgtaaattttagccctgacgtttagctaggaatttatgctgacgtagcgatcgactttagcac<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">34.cggttagggcaaaggttggatttcgacccagggggaaagcccgggacccgaacccagggctttagcgtaggctgacgctaggcttaggttggaacccggaaa<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">35.gcggaagggcgtaggtttgggatgcttagccgtaggctagctttcgacacgatcgattcgcaccacaggataaaagttaagggaccggtaagtcgcggtagcc<O:P>
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style="mso-fareast-font-family: 楷体_GB2312">36.ctagctacgaacgctttaggcgcccccgggagtagtcgttaccgttagtatagcagtcgcagtcgcaattcgcaaaagtccccagctttagccccagagtcgacg<O:P>
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<P class=MsoNormal><SPAN lang=EN-US
style="mso-fareast-font-family: 楷体_GB2312">37.gggatgctgacgctggttagctttaggcttagcgtagctttagggccccagtctgcaggaaatgcccaaaggaggcccaccgggtagatgccasagtgcaccgt<O:P>
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style="mso-fareast-font-family: 楷体_GB2312">38.aacttttagggcatttccagttttacgggttattttcccagttaaactttgcaccattttacgtgttacgatttacgtataatttgaccttattttggacactttagtttgggttac<O:P>
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style="mso-fareast-font-family: 楷体_GB2312">39.ttagggccaagtcccgaggcaaggaattctgatccaagtccaatcacgtacagtccaagtcaccgtttgcagctaccgtttaccgtacgttgcaagtcaaatccat<O:P>
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style="mso-fareast-font-family: 楷体_GB2312">40.ccattagggtttatttacctgtttattttttcccgagaccttaggtttaccgtactttttaacggtttacctttgaaatttttggactagcttaccctggattt</SPAN><SPAN
lang=EN-US>aacggccagttt</SPAN></P>
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<P class=MsoPlainText><B style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.0pt">B题<SPAN
style="mso-spacerun: yes"> </SPAN>钢管订购和运输<O:P> </O:P></SPAN></B></P>
<P class=MsoPlainText><SPAN lang=EN-US><SPAN
style="mso-tab-count: 1"> </SPAN>要铺设一条<SPAN
style="mso-text-raise: -6.0pt"><!--[if gte vml 1]><V:SHAPETYPE id=_x0000_t75
stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t"
o:spt="75" coordsize="21600,21600"> <V:STROKE joinstyle="miter"><V:FORMULAS><V:F
eqn="if lineDrawn pixelLineWidth 0"><V:F eqn="sum @0 1 0"><V:F
eqn="sum 0 0 @1"><V:F eqn="prod @2 1 2"><V:F eqn="prod @3 21600 pixelWidth"><V:F
eqn="prod @3 21600 pixelHeight"><V:F eqn="sum @0 0 1"><V:F
eqn="prod @6 1 2"><V:F eqn="prod @7 21600 pixelWidth"><V:F
eqn="sum @8 21600 0"><V:F eqn="prod @7 21600 pixelHeight"><V:F
eqn="sum @10 21600 0"></V:FORMULAS><V:PATH o:connecttype="rect"
gradientshapeok="t" o:extrusionok="f"><O:LOCK aspectratio="t"
v:ext="edit"></V:SHAPETYPE><V:SHAPE id=_x0000_i1025
style="HEIGHT: 18pt; WIDTH: 105.75pt" fillcolor="window" o:ole=""
type="#_x0000_t75"><V:IMAGEDATA o:title=""
src="file:///C:/WINDOWS/TEMP/msoclip1/01/clip_image001.wmz"></V:SHAPE><![endif]--><IMG
height=24 src="2000.files/2000.h1.gif" width=141 v:shapes="_x0000_i1025"></SPAN><!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1025"
DrawAspect="Content" ObjectID="_1048156846">
</o:OLEObject>
</xml><![endif]--> 的输送天然气的主管道, 如图一所示(见下页)。经筛选后可以生产这种主管道钢管的钢厂有<SPAN
style="mso-text-raise: -6.0pt"><!--[if gte vml 1]><V:SHAPE id=_x0000_i1026
style="HEIGHT: 18pt; WIDTH: 57.75pt" fillcolor="window" o:ole=""
type="#_x0000_t75"> <V:IMAGEDATA o:title=""
src="file:///C:/WINDOWS/TEMP/msoclip1/01/clip_image003.wmz"></V:SHAPE><![endif]--><IMG
height=24 src="2000.files/2000.h2.gif" width=77 v:shapes="_x0000_i1026"></SPAN><!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1026"
DrawAspect="Content" ObjectID="_1048156847">
</o:OLEObject>
</xml><![endif]-->
。图中粗线表示铁路，单细线表示公路，双细线表示要铺设的管道(假设沿管道或者原来有公路，或者建有施工公路)，圆圈表示火车站，每段铁路、公路和管道旁的阿拉伯数字表示里程(单位km)。</SPAN></P>
<P class=MsoPlainText style="TEXT-INDENT: 21.25pt">为方便计，<SPAN
lang=EN-US>1km主管道钢管称为1单位钢管。</SPAN></P>
<P class=MsoPlainText style="TEXT-INDENT: 21.25pt">一个钢厂如果承担制造这种钢管，至少需要生产<SPAN
lang=EN-US>500个单位。钢厂<SPAN
style="mso-text-raise: -6.0pt"><!--[if gte vml 1]><V:SHAPE id=_x0000_i1027
style="HEIGHT: 18pt; WIDTH: 12.75pt" fillcolor="window" o:ole=""
type="#_x0000_t75"> <V:IMAGEDATA o:title=""
src="file:///C:/WINDOWS/TEMP/msoclip1/01/clip_image005.wmz"></V:SHAPE><![endif]--><IMG
height=24 src="2000.files/2000.h3.gif" width=17 v:shapes="_x0000_i1027"></SPAN><!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1027"
DrawAspect="Content" ObjectID="_1048156848">
</o:OLEObject>
</xml><![endif]--> 在指定期限内能生产该钢管的最大数量为<SPAN style="mso-text-raise: -6.0pt"><!--[if gte vml 1]><V:SHAPE id=_x0000_i1028
style="HEIGHT: 18pt; WIDTH: 11.25pt" fillcolor="window" o:ole=""
type="#_x0000_t75"> <V:IMAGEDATA o:title=""
src="file:///C:/WINDOWS/TEMP/msoclip1/01/clip_image007.wmz"></V:SHAPE><![endif]--><IMG
height=24 src="2000.files/2000.h4.gif" width=15 v:shapes="_x0000_i1028"></SPAN><!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1028"
DrawAspect="Content" ObjectID="_1048156849">
</o:OLEObject>
</xml><![endif]--> 个单位，钢管出厂销价1单位钢管为<SPAN style="mso-text-raise: -6.0pt"><!--[if gte vml 1]><V:SHAPE id=_x0000_i1029
style="HEIGHT: 18pt; WIDTH: 14.25pt" fillcolor="window" o:ole=""
type="#_x0000_t75"> <V:IMAGEDATA o:title=""
src="file:///C:/WINDOWS/TEMP/msoclip1/01/clip_image009.wmz"></V:SHAPE><![endif]--><IMG
height=24 src="2000.files/2000.h5.gif" width=19 v:shapes="_x0000_i1029"></SPAN><!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1029"
DrawAspect="Content" ObjectID="_1048156851">
</o:OLEObject>
</xml><![endif]--> 万元，如下表：</SPAN></P><!--mstheme--></FONT>
<TABLE border=1 borderColorDark=#333333 borderColorLight=#666633 cellPadding=0
cellSpacing=0
style="BORDER-BOTTOM: medium none; BORDER-COLLAPSE: collapse; BORDER-LEFT: medium none; BORDER-RIGHT: medium none; BORDER-TOP: medium none; MARGIN-LEFT: 14.45pt; mso-table-layout-alt: fixed; mso-border-alt: solid windowtext .5pt; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt">
<TBODY>
<TR style="HEIGHT: 22pt">
<TD
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; HEIGHT: 22pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 51.45pt"
width=69><!--mstheme--><FONT face=宋体>
<P align=center class=MsoPlainText style="TEXT-ALIGN: center"><SPAN
lang=EN-US><SPAN
style="mso-text-raise: -3.0pt"><!--[if gte vml 1]><V:SHAPE id=_x0000_i1030
style="HEIGHT: 12.75pt; WIDTH: 6.75pt" fillcolor="window" o:ole=""
type="#_x0000_t75"><V:IMAGEDATA o:title=""
src="file:///C:/WINDOWS/TEMP/msoclip1/01/clip_image011.wmz"></V:SHAPE><![endif]--><IMG
height=17 src="2000.files/2000.h6.gif" width=9
v:shapes="_x0000_i1030"></SPAN><!--[if gte mso 9]><xml>
<o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="_x0000_i1030"
DrawAspect="Content" ObjectID="_1048156852">
</o:OLEObject>
</xml><![endif]--> </SPAN></P><!--mstheme--></FONT></TD>
<TD
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; HEIGHT: 22pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 51.45pt; mso-border-left-alt: solid windowtext .5pt"
width=69><!--mstheme--><FONT face=宋体>
<P align=center class=MsoPlainText style="TEXT-ALIGN: center"><SPAN
lang=EN-US>1</SPAN></P><!--mstheme--></FONT></TD>
<TD
style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: medium none; BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; HEIGHT: 22pt; PADDING-BOTTOM: 0cm; PADDING-LEFT: 5.4pt; PADDING-RIGHT: 5.4pt; PADDING-TOP: 0cm; WIDTH: 51.45pt; mso-border-left-alt: solid windowtext .5pt"
width=69><!--mstheme--><FONT face=宋体>
<P align=center class=MsoPlainText style="TEXT-ALIGN: center"><SPAN
lang=EN-US>2</SPAN></P><!--mstheme--></FONT></TD>
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