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我国封建社会时期文书工作有哪些主要特点?

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The purpose of treating the cooling water of the diesel engine is to() Ⅰ. resist the scale formation in the cooling chamber Ⅱ.lubricate the engine part Ⅲ.increase thermal capacity Ⅳ.resist corrosion

A. Ⅰ+Ⅱ
B. Ⅱ+Ⅲ
C. Ⅲ+Ⅳ
D. Ⅰ+Ⅳ

悲剧有哪些特征?

什么叫定开距?

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