Useful Expressions 生产经营管理 production operation management 产品和服务质量 product and service quality 产品质量保证 product quality assurance 产品质量控制 product quality control 产品质量标准 product quality standard 产品质量差异 product quality variance 质量审核制度 quality auditing system 品质证明书 quality certificate 质量检测 quality checkUseful Expressions production & operation management product and service quality product quality assurance product quality control product quality standard product quality variance quality auditing system quality certificate quality check 生产经营管理 产品和服务质量 产品质量保证 产品质量控制 产品质量标准 产品质量差异 质量审核制度 品质证明书 质量检测