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当前学科：AdobeAcrobat
题目：
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在Acrobat5.0C中可以创建按钮，并利用JavaScript实现跳至页面功能。如JavaScript语句“this.pageNum--”可以实现下列哪项功能？（）
A . 跳至上一页
B . 跳至下一页
C . 跳至第一页
D . 跳至最后一页
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