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How many parts does a science and technology paper consist of？ What are they？

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按事故的伤害对象分，事故可分为和两大类

How many forms can articles be roughly divided into？what are they？

What are the characteristics of good writings？

煤炭工业企业伤亡事故按事故类型分为：___、_、_、、_、_、____