7.The usefullife of engineering plastics was predicted within the storage period using a polynomial fitting curve method, and its storage life deadline was inspected.
9.Article 15An enterprise shall, in accordance with the nature and use of a fixed asset, reasonably ascertain its usefullife and expected net salvage value.
10.The microcosmic structure of metal material directly influence to the capability and usefullife of mechanism accessory. Metallography analyzing is the important means of controlling inhesion quality.
