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微型计算机的I/O总线，分为三种：数据总线、地址总线和【】。

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【】与传统文本的线性结构不同，它采用一种网状结构(非线性结构)来组织信息，各信息块很容易按照其内容的关系加以组织。

对出口蜂蜜产品在检验检疫上有何规定？

保险单的作用有哪些？

听力原文： Fat on human beings is distributed in different ways. / Some fat people have a large stomach and no waistline / --which makes them look round, rather like apples. / Others are fatter below the waist, / which makes them appear pear-shaped. / There arc two types of fat: / external fat and internal fat. / Doctors, who have been examining the relationship between health and fatness / have found that the ' pears' have less internal fat, / but the ' apples' have more internal fat than external fat. / This seems to be what causes the health problems./
The best treatment for fatness is to reduce the internal fat. / But unfortunately it seems that / dieting simply makes an apple-shaped person into a smaller apple / and a pear-shaped person into a smaller pear. l At the moment there is no known way of reducing the internal rather than external fat./
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