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<title>●试题一</title>
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<div class=Section1>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>●试题一<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［问题</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】①数据流名：目的地；起点：<span
lang=EN-US>"接收目的地"；终点："核查"。②数据流名：投入的钱；起点"接收钱"；终点："核查"。③数据流名：剩余的钱；起点"核查"；终点："退还钱"。<o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【解析】转换图是在数据流程图中附加了过程控制的部分，该图描述了自动售票系统的基本行为。根据说明中给出的系统需求描述和转换图，可以看出该图没有完整的描述系统的基本行为。由于乘客选择的目的地需要经过系统的验证，确定是否是合法的目的地，因此缺少的数据流起点为<span
lang=EN-US>"接收目的地"，终点为"核查"。转换图中只给出了将乘客投入的钱全额退还的数据流，没有给出在其他的情况下系统核查和退钱的数据流。因此缺少两条数据流：一条数据流的起点为"接收钱"，终点为"核查"；另一条数据流的起点为"核查"，终点为"退还钱"。<o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［问题</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>a </span><span lang=EN-US
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>-</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'> </span><span lang=EN-US
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>"取消"操作</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>b </span><span lang=EN-US
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>-</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'> </span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>核查正确</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>c </span><span lang=EN-US
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>-</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'> </span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>出票结束。<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【解析】结合试题考查状态迁移图，状态<span
lang=EN-US>"正在接收投钱"之后什么事件能够导致"退钱"，同时还要注意到该事件之后状态转移到"等待选择目的地"。显然，在接受投币之后如果正常发展的话应该是出票，出票的同时退还多余的钱。所以事件</span></span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>a</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>是发生在<span
lang=EN-US>"接收投钱"之后"出票"之前发生的导致退钱的事件，仔细考查试题说明，事件</span></span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>a</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>应该是<span
lang=EN-US>"取消"，因为在试题的说明部分特别提到"出票钱乘客可以按</span></span><span
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