PPR yeeb nkab nqe daim ntawv teev npe

PPR cov kav dej, nrog lawv lub zog siab thiab kub ua haujlwm los ntawm kev siv tshuab copolymerization random, tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev siv dej hauv tsev. Nws cov cua sov fusion kev sib txuas ua kom xoom xoom, is environmentally friendly…