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Book Description paperback. Condition: New. Language:Chinese.Biogas production workers are engaged in construction of rural household biogas digesters. sewage purification and large biogas digesters. equipment installation. commissioning. engineering. operation. maintenance and biogas production and management personnel. To improve the theoretical and practical skills of employees. we follow the national occupational standards biogas production workers' knowledge framework and should be aware that should be of professional skill requir. Seller Inventory # BY063582