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<title>第三章</title>
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 <div v:shape="_x0000_s145410" class=B style='position:absolute;top:4.5%;
 left:7.67%;width:72.28%;height:6.0%'><span style='mso-special-format:nobullet;
 display:none'>&#8226;</span><span lang=EN-US style='font-size:88%;color:#FF3300;
 mso-fareast-language:ZH-CN'><b>3.4.3<span
 style='mso-spacerun:yes'>&nbsp;&nbsp; </span></b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:88%;color:#FF3300'><b>关系运算符与关系表达式</b></span><span
 style='font-size:88%;color:#FF3300'><b> </b></span><span style='font-family:
 宋体;mso-fareast-font-family:宋体;mso-special-format:lastCR;display:none'><b>&#13;</b></span></div>
 <div v:shape="_x0000_s145411">
 <div class=O1 style='mso-margin-left-alt:468'></div>
 <div class=O2 style='mso-margin-left-alt:720'></div>
 <div class=O3 style='mso-margin-left-alt:1008'></div>
 <div class=O4 style='mso-margin-left-alt:1296'></div>
 <div class=O style='mso-line-spacing:"100 20 0";mso-margin-left-alt:216;
 position:absolute;top:1.75%;left:.93%;width:98.12%;height:6.25%'><span
 style='font-family:宋体;mso-ascii-font-family:宋体;mso-fareast-font-family:宋体;
 font-size:133%;display:none'><b>&#13;</b></span></div>
 <div class=O style='mso-line-spacing:"100 20 0";mso-margin-left-alt:216;
 position:absolute;top:9.75%;left:.93%;width:98.12%;height:6.75%'><span
 style='font-size:133%'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></b></span></div>
 </div>
 <div v:shape="_x0000_s145412" class=O>
 <div style='mso-line-spacing:"120 10 0"'><span style='position:absolute;
 top:11.75%;left:11.04%;width:102.62%;height:5.25%'><b><span
 style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></b><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>关系运算符都是双目运算,是用来比较两个运算量之间</b></span></span><span
 style='position:absolute;top:18.75%;left:11.04%;width:104.68%;height:4.75%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>的关系,关系表达式的运算结果为逻辑量。若关系成立,结</b></span></span><span
 style='position:absolute;top:24.75%;left:11.04%;width:88.2%;height:5.25%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>果为</b></span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'><b>True</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>,若关系不成立,结果为</b></span><span
 lang=EN-US style='mso-fareast-language:ZH-CN'><b>False</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体'><b>。&#13;</b></span></span></div>
 <div style='mso-line-spacing:"120 10 0";position:absolute;top:31.5%;
 left:11.04%;width:88.2%;height:5.25%'><b><span
 style='mso-spacerun:yes'>&nbsp;</span>VB</b><span style='font-family:宋体;
 mso-fareast-font-family:宋体'><b>中的关系运算符如下表所示。</b></span><b> </b></div>
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 width:10.29%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>运算符&#13;</b></span></div>
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 position:absolute;top:47.0%;left:7.49%;width:8.61%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145419" class=O>
 <div style='text-align:center;position:absolute;top:42.5%;left:20.59%;
 width:16.47%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>含义&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:47.0%;left:20.59%;width:16.47%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145422" class=O>
 <div style='text-align:center;position:absolute;top:42.5%;left:41.38%;
 width:17.6%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>优先级&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:47.0%;left:41.38%;width:17.79%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145425" class=O>
 <div style='text-align:center;position:absolute;top:42.5%;left:63.67%;
 width:21.53%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>实例&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:47.0%;left:63.67%;width:21.53%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145428" class=O>
 <div style='text-align:center;position:absolute;top:42.5%;left:89.7%;
 width:13.85%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>结果&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:47.0%;left:89.7%;width:13.85%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145431" class=O>
 <div style='text-align:center;position:absolute;top:48.0%;left:7.49%;
 width:8.61%;height:4.25%'><span lang=EN-US style='font-size:83%;mso-fareast-language:
 ZH-CN'><b>&lt;&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:52.75%;left:7.49%;width:8.61%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145434" class=O>
 <div style='text-align:center;position:absolute;top:48.5%;left:20.59%;
 width:16.47%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>小于&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:52.75%;left:20.59%;width:16.47%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145437" class=O>
 <div style='text-align:center'><span style='position:absolute;top:48.5%;
 left:40.07%;width:20.22%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>所有关系运算</b></span></span><span style='position:absolute;
 top:52.75%;left:40.07%;width:20.22%;height:4.0%'><span style='font-family:
 宋体;mso-fareast-font-family:宋体;font-size:83%'><b>优先级相同。</b></span></span><span
 style='position:absolute;top:57.25%;left:40.07%;width:20.22%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%'><b>低于算术运算</b></span></span><span
 style='position:absolute;top:61.25%;left:40.82%;width:18.91%;height:4.25%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%'><b>的加</b></span><span
 style='font-size:83%'><b>“</b></span><span lang=EN-US style='font-size:83%;
 mso-fareast-language:ZH-CN'><b>+</b></span><span lang=EN-US style='font-size:
 83%;mso-fareast-language:ZH-CN'><b>”</b></span><span style='font-family:宋体;
 mso-fareast-font-family:宋体;font-size:83%'><b>,减</b></span></span><span
 style='position:absolute;top:65.75%;left:41.19%;width:17.97%;height:4.25%'><span
 style='font-size:83%'><b>“</b></span><span lang=EN-US style='font-size:83%;
 mso-fareast-language:ZH-CN'><b>-</b></span><span lang=EN-US style='font-size:
 83%;mso-fareast-language:ZH-CN'><b>”</b></span><span style='font-family:宋体;
 mso-fareast-font-family:宋体;font-size:83%'><b>运算,高</b></span></span><span
 style='position:absolute;top:70.5%;left:41.38%;width:17.79%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%'><b>于逻辑非</b></span></span><span
 style='position:absolute;top:74.75%;left:40.82%;width:18.72%;height:4.25%'><span
 style='font-size:83%'><b>“</b></span><span lang=EN-US style='font-size:83%;
 mso-fareast-language:ZH-CN'><b>Not</b></span><span lang=EN-US
 style='font-size:83%;mso-fareast-language:ZH-CN'><b>”</b></span><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%'><b>运算。&#13;</b></span></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:79.5%;left:41.38%;width:17.79%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145440" class=O>
 <div style='text-align:center;position:absolute;top:48.0%;left:63.67%;
 width:21.53%;height:4.25%'><span lang=EN-US style='font-size:83%;mso-fareast-language:
 ZH-CN'><b>15+10&lt;20&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:52.75%;left:63.67%;width:21.53%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145443" class=O>
 <div style='text-align:center;position:absolute;top:48.0%;left:89.7%;
 width:13.85%;height:4.25%'><span lang=EN-US style='font-size:83%;mso-fareast-language:
 ZH-CN'><b>False&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:52.75%;left:89.7%;width:13.85%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145446" class=O>
 <div style='text-align:center;position:absolute;top:54.0%;left:7.49%;
 width:8.61%;height:4.25%'><span lang=EN-US style='font-size:83%;mso-fareast-language:
 ZH-CN'><b>&lt;=&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:58.75%;left:7.49%;width:8.61%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145449" class=O>
 <div style='text-align:center;position:absolute;top:54.25%;left:20.22%;
 width:17.04%;height:4.0%'><span style='font-family:宋体;mso-fareast-font-family:
 宋体;font-size:83%'><b>小于或等于&#13;</b></span></div>
 <div style='text-align:center;mso-char-wrap:0;mso-kinsoku-overflow:0;
 position:absolute;top:58.75%;left:20.59%;width:16.47%;height:4.0%'><span
 style='font-family:宋体;mso-fareast-font-family:宋体;font-size:83%;mso-special-format:
 lastCR;display:none'><b>&#13;</b></span></div>
 </div>
 <div v:shape="_x0000_s145452" class=O>
 <div style='text-align:center;position:absolute;top:54.0%;left:63.67%;

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