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<p align="center" class="style1">全国计算机技术与软件专业技术资格(水平)考试 <br>
全真模拟试卷(一)上午试题(考试时间9∶00～11∶30，共150分钟)</p>
<span class="style1">1.本试卷的试题中共有75个空格，需要全部解答，每个空格1分，满分75分 </span>
<p class="style1">2.每个空格对应一个序号，有A、B、C、D四个选项，请选择一个最恰当的选项作为解答。<br>
<br>
●在某个计算机系统中，内存地址与I/O地址统一编址，访问内存单元和I/O设备是靠<u> (1) </u>来区分的。</p>
<p class="style1">
(1)
<input type=radio name=tba1 Value = 0 >
A.数据总线上输出的数据<br>
<input type=radio name=tba1 Value = 1>
B.不同的地址代码 <br>
<input type=radio name=tba1 Value =0 >
C.内存与I/0设备使用不同的地址总线 <br>
<input type=radio name=tba1 Value = 0>
D.不同的指令 </p>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="13%" valign="top" class="title">
<span class="style1">
<input name=tba1 type=text id="tba1" size=10 >
</span></td>
<td width="87%" valign="top"><span class="style1" style="text-align:left;"><img src="images/anniu.gif" width="78" height="22" img style="CURSOR: hand" onClick=DisplayOrHidden(T1)></span>
<table width="96%" border="0">
<tr>
<td><p align=left class="style1" style='text-align:left;'><SPAN id=T1 style="BORDER-RIGHT: #ffffff 1px solid; BORDER-TOP: #ffffff 1px solid; DISPLAY: none; BORDER-LEFT: #ffffff 1px solid; COLOR: black; BORDER-BOTTOM: #ffffff 1px solid; FONT-FAMILY: 宋体"><span class="STYLE1" style="font-family: 宋体"><strong> </strong></span><span class="style1">【解析】本题考查的是计算机系统的编址方式，考生必须要了解内存和I/O设备在计算机系统中是如何编址的，并如何区分这些地址。
所谓统一编址，就是将内存和I/O设备的地址放在一个连续的地址空间内，对于内存和不同的I/O设备，它们的地址在这个连续的地址空间内被划分为不同的块。这些地址块有一个范围，对这个范围内的地址进行寻址，则可以访问相应的设备。因此，统一编址的方式是根据不同的地址代码来区分不同的设备。</td>
</tr>
</table></td>
</tr>
</table>
<p class="style1">●USB是<u> (2) </u>。</p>
<p class="style1">
(2)
<input type=radio name=tba2 Value = 0>
A.并行总线 <br>
<input type=radio name=tba2 Value = 0 >
B.串行总线 <br>
<input type=radio name=tba2 Value = 0 >
C.通用接口<br>
<input type=radio name=tba2 Value = 1 >
D.通用串行接口总线</p>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="13%" valign="top" class="title">
<span class="style1">
<input name=tba2 type=text id="tba2" size=10 >
</span></td>
<td width="87%" valign="top"><span class="style1" style="text-align:left;"><img src="images/anniu.gif" width="78" height="22" img style="CURSOR: hand" onClick=DisplayOrHidden(T2)></span>
<table width="96%" border="0">
<tr>
<td><p align=left style='text-align:left;'>
<span class="style1"><SPAN id=T2 style="BORDER-RIGHT: #ffffff 1px solid; BORDER-TOP: #ffffff 1px solid; DISPLAY: none; BORDER-LEFT: #ffffff 1px solid; COLOR: black; BORDER-BOTTOM: #ffffff 1px solid; FONT-FAMILY: 宋体"><span class="STYLE1" style="font-family: 宋体"><strong> </strong></span><span class="style1">
【解析】USB 是一种通用串行接口总线。它可连127个设备，占用1 个中断，支持12Mbps数据传输率。</span></td>
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</table></td>
</tr>
</table>
<p class="style1">●一个32K×32位的主存储器，其地址线和数据线的总和为<u> (3) </u>根。</p>
<p class="style1">
(3)
<input type=radio name=tba3 Value = 0 >
A.64 <br>
<input type=radio name=tba3 Value = 1 >
B.47 <br>
<input type=radio name=tba3 Value = 0 >
C.48<br>
<input type=radio name=tba3 Value = 0 >
D.36</p>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="13%" valign="top" class="title">
<span class="style1">
<input name=tba3 type=text id="tba3" size=10 >
</span></td>
<td width="87%" valign="top"><span class="style1" style="text-align:left;"><img src="images/anniu.gif" width="78" height="22" img style="CURSOR: hand" onClick=DisplayOrHidden(T3)></span>
<table width="96%" border="0">
<tr>
<td class="style1"><SPAN id=T3 style="BORDER-RIGHT: #ffffff 1px solid; BORDER-TOP: #ffffff 1px solid; DISPLAY: none; BORDER-LEFT: #ffffff 1px solid; COLOR: black; BORDER-BOTTOM: #ffffff 1px solid; FONT-FAMILY: 宋体"><span class="STYLE1" style="font-family: 宋体"><strong> </strong></span><span class="style1"><span class="style1">
【解析】32K×32位的存储器，其数据线需要32根；32K是其容量大小，根据2的n次幂＝32×1024可以计算出：n＝15。于是至少需要15根地址线，所以，所需的地址和数据线总和为47。 </td>
</tr>
</table></td>
</tr>
</table>
<p class="style1">●下面关于系统总线的描述中，正确的概念是<u> (4) </u>。</p>
<P CLASS=style1>
(4)
<input type=radio name=tba4 Value = 0 >
A.地址信息和数据信息不能同时出现<br>
<input type=radio name=tba4 Value = 0 >
B.地址信息和控制信息不能同时出现<br>
<input type=radio name=tba4 Value = 0>
C.数据信息和控制信息不能同时出现<br>
<input type=radio name=tba4 Value = 1 >
D.两种信息源的代码不能在总线中同时出现</P>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="13%" valign="top" class="title">
<span class="style1">
<input name=tba4 type=text id="tba4" size=10 >
</span></td>
<td width="87%" valign="top"><span class="style1" style="text-align:left;"><img src="images/anniu.gif" width="78" height="22" img style="CURSOR: hand" onClick=DisplayOrHidden(T4)></span>
<table width="96%" border="0">
<tr>
<td class="style1"><SPAN id=T4 style="BORDER-RIGHT: #ffffff 1px solid; BORDER-TOP: #ffffff 1px solid; DISPLAY: none; BORDER-LEFT: #ffffff 1px solid; COLOR: black; BORDER-BOTTOM: #ffffff 1px solid; FONT-FAMILY: 宋体"><span class="STYLE1" style="font-family: 宋体"><strong> </strong></span><span class="style1">
【解析】在系统总线中，地址信息、数据信息、控制信息是可以同时出现的。为了便于区分它们，任何两种信息源的代码不能在总线中同时出现。</td>
</tr>
</table></td>
</tr>
</table>
<p class="style1">●CMM模型将软件过程的成熟度分为5个等级，在<u> (5) </u>使用定量分析来不断地改进和管理软件过程。</p>
<p class="style1">
(5)
<input type=radio name=tba5 Value = 1 >
A.优化级<br>
<input type=radio name=tba5 Value = 0 >
B.管理级<br>
<input type=radio name=tba5 Value = 0>
C.定义级<br>
<input type=radio name=tba5 Value = 0 >
D.初始级<br>
</p>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="13%" valign="top" class="title">
<span class="style1">
<input name=tba5 type=text id="tba5" size=10 >
</span></td>
<td width="87%" valign="top"><span class="style1" style="text-align:left;"><img src="images/anniu.gif" width="78" height="22" img style="CURSOR: hand" onClick=DisplayOrHidden(T5)></span>
<table width="96%" border="0">
<tr>
<td class="style1"><SPAN id=T5 style="BORDER-RIGHT: #ffffff 1px solid; BORDER-TOP: #ffffff 1px solid; DISPLAY: none; BORDER-LEFT: #ffffff 1px solid; COLOR: black; BORDER-BOTTOM: #ffffff 1px solid; FONT-FAMILY: 宋体"><span class="STYLE1" style="font-family: 宋体"><strong> </strong></span><span class="style1"><span class="style1">
【解析】CMM是软件能力成熟度模型，CMM的分级结构可以描述为：
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