[求助]一个企业为何同时拥有甲，乙两种工程资质？

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<p>看政策文件，甲级资质的作用完全可以覆盖它的下级资质，那为什么信产部公布的文件中，许多企业既拥有甲级资质，又拥有乙级咨质？</p><p>比如工程资询资质：</p><p><a href="http://www.mii.gov.cn/art/2006/03/08/art_1344_7680.html">http://www.mii.gov.cn/art/2006/03/08/art_1344_7680.html</a></p><p><table cellspacing="0" cellpadding="0" width="746" border="0" style="WIDTH: 559pt; BORDER-COLLAPSE: collapse;"><tbody><tr height="26" style="HEIGHT: 20.1pt; mso-height-source: userset;"><td class="xl28" width="48" height="52" rowspan="2" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: gray 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 36pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 40.2pt; BACKGROUND-COLOR: transparent;"><p align="left"><font color="#000000">16</font></p></td><td class="xl31" width="431" rowspan="2" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: gray 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 323pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"><p align="left"><font color="#000000">上海电信规划设计院有限公司</font></p></td><td class="xl25" width="147" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: gray 0.5pt solid; BORDER-LEFT: #d4d0c8; WIDTH: 110pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"><p align="left"><font color="#000000">工咨甲级</font></p></td><td class="xl31" width="120" rowspan="2" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: gray 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 90pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"><p align="left"><font color="#000000">2032203001</font></p></td></tr><tr height="26" style="HEIGHT: 20.1pt; mso-height-source: userset;"><td class="xl25" width="147" height="26" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: gray 0.5pt solid; BORDER-LEFT: #d4d0c8; WIDTH: 110pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 20.1pt; BACKGROUND-COLOR: transparent;"><p align="left"><font color="#000000">工咨乙级</font></p></td></tr></tbody></table></p><p align="left">通信工程设计资质：</p><p align="left"><a href="http://www.mii.gov.cn/art/2006/03/08/art_1344_7681.html">http://www.mii.gov.cn/art/2006/03/08/art_1344_7681.html</a></p><p align="left"><table cellspacing="0" cellpadding="0" width="440" align="left" border="0" style="WIDTH: 440pt; BORDER-COLLAPSE: collapse;"><tbody><tr height="28" style="HEIGHT: 21pt; mso-height-source: userset;"><td class="xl28" height="56" rowspan="2" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 42pt; BACKGROUND-COLOR: transparent;"><p align="left">43</p></td><td class="xl25" width="295" rowspan="2" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 221pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent;"><p align="left">云南省电力设计院</p></td><td class="xl25" width="207" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; WIDTH: 155pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent;"><p align="left">通信工程设计甲级</p></td><td class="xl25" width="122" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; WIDTH: 92pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent;"><p align="left">230007-sj</p></td></tr><tr height="28" style="HEIGHT: 21pt; mso-height-source: userset;"><td class="xl25" width="207" height="28" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; WIDTH: 155pt; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 21pt; BACKGROUND-COLOR: transparent;"><p align="left">通信工程设计乙级</p></td><td class="xl25" width="122" style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; WIDTH: 92pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent;"><p align="left">230007-sy</p></td></tr></tbody></table></p><p align="left"></p><p align="left"></p><p align="left"></p><p align="left">哪位高手解答一下，谢谢了。</p>