Level 4: Testing and Quality assurance.
四级：测试和品质保证。
This system will make for increasing level of control and assurance safety in mine production.
该系统可用于提高煤矿企业的科学管理水平，保证井下的安全生产。
Quality assurance: a long tradition, traceability management, state-level standardized production model zone.
品质的保证：悠久传承，溯源管理，国家级标准化生产示范区。
Quality assurance: a long tradition, traceability management, state-level standardized production model zone.
品质的保证：悠久传承，溯源管理，国家级标准化生产示范区。
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