求翻译：盐业专营体制改革势在必行，为行之有效地应对这一变革，确保公司健康、可持续发展，盐业公司中层管理人员必须转变观念，提高经营管理能力，以适应市场经济的需求。而培训是增强管理人员应变能力的必要手段，恰当的培训方式的选择对达到预期的培训效果起到至关重要的作用。本文在层次分析法的基础上，认为盐业公司中层管理人员培训的最佳方式是分级分层选拔培训方式，其次是职务轮换培训方式。是什么意思？

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