• Purchase and sale of goods or supply of standard products: this method of determining the quality of the goods based on the standard of quality, standard production methods, processing, packing, check out the goods ... for example iso 9000 ISO ... as a basis to determine the quality goods.• Purchase and sale of goods by sample: this method of determining the quality of the goods on the base a few goods that the seller take modeling. The seller is obliged to deliver goods to the buyer in the correct form. Goods will form the basis to do the confronting with the goods to be delivered, if the parties to the Agreement applying this way, the model will have to preserve the principle of retention select 3 templates for the seller, the buyer and the third party store, all the samples which are to be certified by the party , be sealed and preserved properly welfares for model engineering.• Some other method: purchase and sale of goods can be determined through specification of qualities of goods (Specification), or just something familiar, pepper or content in the goods ...
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