Problems existed in simulation scale-up, engineering design, equipment manufacture and materials properties are main causes for the slow technical progress of the ammonia industry in China.
模拟放大、工程设计、设备制造和材料性能的问题，是我国合成氨工业技术进步缓慢的主要原因。
Manufacturing, process or "scale-up" engineering has primary responsibility for designing quality into the manufacturing processes.
制造，工艺或量产工程部门负有制造流程设计质量的基本责任。
Manufacturing, process or "scale-up" engineering has primary responsibility for designing quality into the manufacturing processes.
制造，工艺或量产工程部门负有制造流程设计质量的基本责任。
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