在结构化程序设计中,计算机程序的三种基本控制结构分别是___、_ 和 ___。

<u><span style="font-size:12.0pt;font-family:仿宋_GB2312; mso-hansi-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">顺序结构</span></u>,<u><span style="font-size:12.0pt;font-family:仿宋_GB2312; mso-hansi-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">分支结构</span></u>,<u><span style="font-size:12.0pt;font-family:仿宋_GB2312; mso-hansi-font-family:&quot;Times New Roman&quot;;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:AR-SA">循环结构</span></u>