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400×600额式破碎机,1 引言 ································································································································1 2 选题背景 ························································································································3 2.1 破碎机研究的目的和意义 ··························································································3 2.2 颚式破碎机特点和现状与发展 ··················································································3 2.2.1 复摆颚式破碎机的特点 ··························································································3 2.2.2 复摆颚式破碎机的现状与。