Ptt 大爆卦 | . guts ptt - 前往 https://link.springer.com/10.1007/978-3-642-36199-9_239-1

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PET (Poly(ethylene terephthalate)) and PTT ...

PTT (poly(trimethylene terephthalate)) is also a synthetic aromatic ... fibers and for special use as racket guts and musical bowstrings, umbrella fabric, ...

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