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並前往https://books.google.com.tw/books?id=z7MB1G1bUp8C&pg=PA45&lpg=PA45&dq=threads+ptt&source=bl&ots=zecDtjuZ6y&sig=ACfU3U0mDWXm4vjUfK-qR0LBQBsmcvcXag&hl=zh-TW&sa=X&ved=2ahUKEwjvj4y3_Pv_AhX9qFYBHSSyALYQ6AF6BQi8AhAD

Plastics End Use Applications - 第 45 頁 - Google 圖書結果

PTT is a semicrystalline polyester, closely related to the more common ... mold and are formed to shape under pressure with helically reinforced threads.

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