地沟油是质量极差的非食用油，若用于食用会严重危害人的身体健康。
The waste oils may greatly harm people's healthy due to their poor quality.
水和环境卫生的总体质量仍然极差，从而助长了霍乱传播。
The overall quality of water and sanitation remains very poor, therefore facilitating cholera transmission.
最后简介复合极差控制图在质量管理中的应用。
Finally, considers the applications of compound extrema-deviation to quality control.
以渣油、进口重油为原料，生产轻质油(柴油馏分)，产品存在稳定性极差的质量问题。
The diesel distillate originated from import heavy oil or residue exhibited very poor stability.
以渣油、进口重油为原料，生产轻质油(柴油馏分)，产品存在稳定性极差的质量问题。
The diesel distillate originated from import heavy oil or residue exhibited very poor stability.
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