hedef anı vatansever nylon teflon and kevlar bozmak dağıtmak Öğretmenler Günü
Kevlar, a nylon polymer prepared by reaction of 1,4-benzenedicarboxylic acid (terephthalic acid) with 1,4-benzenediamine (p-phenylenediamine) is so strong that it's used to make bulletproof vests. Draw the structure of a segment of
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