Select the Select One element from the palette and click in the canvas under the Header element that was just added.

从调色板中选择Select One元素，并单击刚才添加的Header元素下面的画布。

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There is one difference to note here: because an image button is a click-able form element, you should always provide alternate text for it.

这里有一个要注意的不同点：因为图像按钮是可单击的表单元素，所以您应该总是为它提供替代文本。

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