1. PE mining yeeb nkab Ntawm tag nrho cov engineering plastics, HDPE muaj lub siab tshaj plaws hnav tsis kam thiab yog qhov pom tshaj plaws. Qhov siab dua qhov hnyav molecular, cov khoom hnav-tiv taus ntau dua, txawm tias muaj ntau yam khoom siv hlau (xws li carbon steel, stainless hlau, bronze, thiab lwm yam). Nyob rau hauv conditi ...
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