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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">重力的基本概念</h4><div class=\"download_card_msg\">&ensp;&ensp;&ensp;&ensp;1．重力的基本概念 
&ensp;&ensp;&ensp;&ensp;在力学中，重力是最重要、最基本的概念之一。目前为止，国内外各种课本以及大量的参考书对重力概念的定义大致分为以下三类。 
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