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1·By using the process of discarding tailings with shaking table, the rough concentrate with the yield 49.

采用摇床抛尾工艺流程，可得到精矿产率49。

2·In this paper, we present a rough set-based query strategy in a distributed knowledge system and concentrate on the role of knowledge.

本文讨论了分布式知识系统中基于粗糙集合的查询策略，强调了系统中知识的重要性。