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</span><span class=GramE>　　　　　</span><span lang=EN-US>WHERE __(21)__ ))</span>；<span
lang=EN-US><br>
</span>　　<span lang=EN-US>(19)A</span>．<span lang=EN-US>EXISTS</span>　　<span
lang=EN-US>B</span>．<span lang=EN-US>NOT EXISTS</span>　　<span lang=EN-US>C</span>．<span
lang=EN-US>IN</span>　　<span class=GramE>　</span><span lang=EN-US>D</span>．<span
lang=EN-US>NOT IN<br>
</span>　　<span lang=EN-US>(20)A</span>．<span class=SpellE><span lang=EN-US>SPY.Sno</span></span><span
lang=EN-US>='168'</span>　　<span lang=EN-US>B</span>．<span class=SpellE><span
lang=EN-US>SPY.Sno</span></span><span lang=EN-US>&lt;&gt;'168'<br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．<span
class=SpellE><span lang=EN-US>SPY.Sno</span></span><span lang=EN-US>=<span
class=SpellE>SPX.Sno</span></span>　<span lang=EN-US>D</span>．<span
class=SpellE><span lang=EN-US>SPY.Sno</span></span><span lang=EN-US>&lt;&gt;<span
class=SpellE>SPX.Sno</span><br>
</span>　　<span lang=EN-US>(21)A</span>．<span class=SpellE><span lang=EN-US>SPZ.Sno</span></span><span
lang=EN-US>=<span class=SpellE>SPY.Sno</span> AND <span class=SpellE>SPZ.Pno</span>=<span
class=SpellE>SPY.Pno</span><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>B</span>．<span
class=SpellE><span lang=EN-US>SPZ.Sno</span></span><span lang=EN-US>=<span
class=SpellE>SPX.Sno</span> AND <span class=SpellE>SPZ.Pno</span>=<span
class=SpellE>SPX.Pno</span><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>C</span>．<span
class=SpellE><span lang=EN-US>SPZ.Sno</span></span><span lang=EN-US>=<span
class=SpellE>SPX.Sno</span> AND <span class=SpellE>SPZ.Pno</span>=<span
class=SpellE>SPY.Pno</span><br>
</span><span class=GramE>　　　　</span><span lang=EN-US>D</span>．<span
class=SpellE><span lang=EN-US>SPY.Sno</span></span><span lang=EN-US>&lt;&gt;'168'
AND <span class=SpellE>SPZ.Pno</span>=<span class=SpellE>SPY.Pno</span> <o:p></o:p></span></span></p>

<p class=MsoNormal align=left style='mso-margin-top-alt:auto;margin-bottom:
3.0pt;text-align:left;mso-pagination:widow-orphan'><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-bidi-font-family:宋体;color:black;mso-font-kerning:
0pt'>　　<span lang=EN-US>●</span>假设某计算机系统的内存大小为<span lang=EN-US>256K</span>，在某一时刻内存的使用情况如图<span
lang=EN-US>A</span>所示。此时，<span class=GramE>若进程</span>顺序请求<span lang=EN-US>20K</span>、<span
lang=EN-US>10K</span>和<span lang=EN-US>5K</span>的存储空间，系统采用<span lang=EN-US>__(22)__</span>算法<span
class=GramE>为进程</span>依次分配内存，则分配后的内存情况如图<span lang=EN-US>B</span>所示。<span
lang=EN-US> <o:p></o:p></span></span></p>

<div align=center>

<table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 width="89%"
 style='width:89.0%;mso-cellspacing:0cm;border:outset black 1.0pt;mso-border-alt:
 outset black .75pt;mso-padding-alt:0cm 0cm 0cm 0cm'>
 <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>
  <td width="13%" style='width:13.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>起始地址<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="7%" style='width:7.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>OK<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>　<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>50K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>90K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>100K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>105K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>135K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>160K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>175K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>195K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>220K<o:p></o:p></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:1'>
  <td width="13%" style='width:13.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>状态<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="7%" style='width:7.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>已用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>未用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>已用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>已用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>未用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>已用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>未用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>已用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>未用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>未用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>已用<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
 </tr>
 <tr style='mso-yfti-irow:2;mso-yfti-lastrow:yes'>
  <td width="13%" style='width:13.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:宋体;
  color:black;mso-font-kerning:0pt'>容量<span lang=EN-US><o:p></o:p></span></span></p>
  </td>
  <td width="7%" style='width:7.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;background:white;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>20K<o:p></o:p></span></p>
  </td>
  <td width="8%" style='width:8.0%;border:inset black 1.0pt;mso-border-alt:
  inset black .75pt;padding:0cm 0cm 0cm 0cm'>
  <p class=MsoNormal align=center style='text-align:center;mso-pagination:widow-orphan'><span
  lang=EN-US style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-bidi-font-family:
  宋体;color:black;mso-font-kerning:0pt'>30K<o:p></o:p></span></p>
  </td>
12345

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