摘要通过对测定食品中亚硫酸盐过程进行研究，根据样品的特性不同对所采集的样品采用浸泡、超声和蒸馏三种前处理方法。
To study the determination of sulfite in food by pararosaniline hydrochloric spectrophotometry, then according to the sample characteristic, the treatment select soak, ultrasonic and distill.
着重介绍一种简单实用的铝硅合金压铸件涂漆前化学处理工艺及其漆膜的结合性能。
This paper introduces emphatically a kind of chemical treatment process prior to the coating on the die casting pieces of aluminium-silicon alloy and its film adhesion.
对一种用于汽车和通讯行业的新型预磷化镀锌钢板的粉末喷涂前处理工艺进行了研究，通过晶相、膜质量及盐雾试验，对预磷化板的现有工艺进行了改进。
The effects of pretreatment for powder coating on the galvanized steel sheet were investigated through tests of cryslalography, film weight and salt spray test, and the existing process was improved.
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