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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)你会预习吗描述：所谓预习，就是对要学习的课程事先有一定的了解，可以使自己在听课时抓住要点和难点．预习的方法预习有许多办法，这里我们介绍一种简单易行的预习方法，就是“3分钟预习法”．在上课的前一天，或者在即将上课时，你利用1到3分钟的时间，把这堂课将要讲的内</a>';
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