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1)  deterioration [英][di,tiriə'reiʃən]  [美][dɪ,tɪrɪə'reʃən]
劣质化
1.
The operational problems brought by deterioration of ethylene material on plant operation applicability were analyzed,including regress of economic indexes as integrated energy consumption of ethylene,yield of diene,corrosion and breakout of welding line in cracking furnace tube,layer phenomenon in quenching oil,operation fluctuation of alkaline tower,and so on.
分析了乙烯原料劣质化对装置运行适应性带来的几个操作问题,主要有:乙烯综合能耗、双烯收率等技术经济指标下滑,裂解炉炉管焊缝腐蚀穿漏,急冷油出现分层现象,碱洗塔操作波动等。
2.
In this study, the effect of base oils characteristics on ATF performance is investigated, mainly regarding differences in frictional characteristics with deterioration.
本项研究工作主要针对摩擦特性随油品劣质化而发生的变化差别,考察了基础油的特性对ATF性能的影响。
2)  quality go bad
质量劣化
例句>>
3)  worsen water quality
水质劣化
4)  lubricating oil deterioration
油质劣化
例句>>
5)  fuel oil poor-qualitilization
燃油劣质化
6)  oil deterioration
油质劣化，油变质
补充资料：劣质商品
劣质商品（Inferior good）
　　劣质商品是指其收入效应使得实际收人增加导致需求量减少的商品。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条