在page attributes（页面属性）窗口中，单击paper size（纸张尺寸），然后选择新的自定义纸张尺寸。检验尺寸是否正确无误。
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page-attributes 页面层级
page attributes summary 页面属性摘要
In real-time bidding, as soon as a user visits a Web page, the visit is auctioned to the highest bidder, based on attributes such as the type of page visited or previous Web browsing by the user.
WSJ: Online Tracking Increases, Fueled by Ad Auctions
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