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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)人类非凡智力的源泉--大脑皮层描述：大脑皮层是大脑最外层的薄皮状结构。这一层灰色组织的厚度仅有２毫米，它有着错综复杂的褶皱，活像一块揉成一团的纸。褶皱大大增加了皮层的表面积（想象它是一张很大的纸，被揉皱后塞进一个小盒子里）。事实上，如果把整个大脑皮层展开，它的表面积可达0.2</a>';
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