如果现有母版页设置为自定义母版页，则暂时将其他母版页设置为自定义母版页。
If the existing master page is set as Custom master page, temporarily set another master page as Custom master page.
如果现有母版页标记为默认母版页或自定义母版页，则您会收到一条部署错误，表明无法删除母版页。
If an existing master page is marked as either Default master page or Custom master page, you will get a deployment error that states that the master page cannot be deleted.
如果现有母版页标记为默认母版页或自定义母版页，则您会收到一条部署错误，表明无法删除母版页。
If an existing master page is marked as either Default master page or Custom master page, you will get a deployment error that states that the master page cannot be deleted.
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