Daim ntawv thov: nylon engineering plastics raws li ib tug loj npaum li cas, dav siv nyob rau hauv machinery, tsheb, khoom siv, textile khoom, tshuaj, aviation, metallurgy thiab lwm yam kev lag luam.Txhua qhov chaw ntawm lub neej kom dhau los ua cov khoom siv tsis tseem ceeb, xws li ua txhua yam ntawm cov kabmob, rub ...
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