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建立一个班级下拉式列表，列表项中有101班、102班、103班、104班和105班。当点击某个选项时，将这个选项的内容复制到按钮文.本中。要求字体大小为24号，颜色为红色。-Drop-down list to create a class list items 101 classes , 102 classes , 103 classes , 104 classes and 105 classes . When you click on an option , this option is co