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<title>第四章</title>
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88%;mso-fareast-language:ZH-CN'><b>1. If</b></span><span lang=EN-US
style='font-size:88%;mso-fareast-language:ZH-CN'><b>…</b></span><span
lang=EN-US style='font-size:88%;mso-fareast-language:ZH-CN'><b>Then</b></span><span
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lang=EN-US style='font-size:88%;mso-fareast-language:ZH-CN'><b>(</b></span><span
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style='mso-spacerun:yes'> </span></b></span><span
lang=EN-US style='font-size:75%;color:#FF0066;mso-fareast-language:ZH-CN'><b>If
<</b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;
font-size:75%;color:#FF0066'><b>表达式</b></span><span lang=EN-US
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Then </b></span></div>
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</span></b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;
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If </b></span></div>
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lang=EN-US style='font-size:75%;color:#CC3300;mso-fareast-language:ZH-CN'><b>>
Then <</b></span><span style='font-family:宋体;mso-fareast-font-family:宋体;
font-size:75%;color:#CC3300'><b>语句</b></span><span lang=EN-US
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</span>t=x : x=y:<span style='mso-spacerun:yes'> </span>y=t </b></span></div>
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style='mso-spacerun:yes'> </span></b></span><span style='font-family:
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