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

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What are the characteristics of good writings？

煤炭工业企业伤亡事故按事故类型分为：___、_、_、、_、_、____

句子写作：The piano player began to sing loudly.

相向掘进的巷道相距______ 米时，必须停止一个头掘进