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黄化机
黏胶纤维纺丝原液生产中,使老成后的碱纤维素与二硫化碳发生黄化作用生成纤维素黄酸酯,并在后期用碱液进行初步溶解的设备。
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Changtaiguan Tombs of Chu State
Changtai Qu
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Changtang grasslands
Changtang Guojiaji Ziran Baohuqu
Chang Taoist Temple
Changting Museum
Changting Revolutionary sites
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Changtse Feng
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Changwu human remains
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Chang Xingang
Changxing Dao
Changxing Formation
Changxing Haiyangzhuagnbei Chanye Yuanqu
Changxing Zisun tea
Changxin Palace Lamp
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