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未 决问题
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悬而未决的问题
open question
未解决的问题
outstanding problem
未解决的问题
open question
矿产综合利用问题未解决
ore compositive use unsettled
选冶问题未解决
mineral separative and metallurgical problems unsettled
选冶问题未解决
mineral separative and metallurgic problems unsettled
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