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美国劳工部矿山安全保健局已向国内10个矿山经营者发出书面通知书,指责其一系列违反健康义务或安全标准的行为。矿山安全保健局负责政策实施的副局长Gregory
The U.S. Department of Labor’s Mine Safety and Health Administration has issued written notices to 10 domestic mine operators accusing them of a series of violations of their health obligations or safety standards. Gregory, deputy director for policy enforcement at the Mine Safety and Health Administration