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1987年,开滦矿务局广大职工紧密围绕生产建设中的关键问题,以提高经济效益为中心,开展了合理化建议、技术革新
In 1987, a large number of staff and workers of Kailuan Mining Bureau focused closely on the key issues in production and construction, and carried out reasonable suggestions and technological innovations with the focus on improving economic efficiency