Raws li ib qho ntawm cov yas engineering, cov khoom nylon "hloov hlau nrog cov yas, nrog kev ua tau zoo heev", yog siv dav.Vim nws lub teeb yuag, siab zog, nws tus kheej-lubricating, hnav-resistant, anti-corrosion, rwb thaiv tsev thiab ntau lwm yam khoom tshwj xeeb, nws yog ib tug dav siv e ...
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