题目内容

设计一个名为form_book的表单，表单的控件名为forml，文件名为form_book，表单的标题为“图书情况统计”。表单中有一个组合框(名称为Combo1)、一个文本框(名称为Text1)和两个命令按钮“统计”和“退出”(名称分别为Command1和Command2)。运行表单时，组合框中有3个条目“清华”、“北航”、“科学”(只有3个出版社名称，不能输入新的)可供选择，在组合框中选择出版社名称后，如果单击“统计”命令按钮，则文本框显示出book表中该出版社图书的总数。单击“退出”按钮则关闭表单。注意：完成表单设计后要运行表单的所有功能。

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