Hauj lwm lawm
Cov tub ntxhais lub zog ntawm polymer polyethylene buoys yog lawv qhov siab tsis kam ua kom puas tsuaj, cuam tshuam, bio {{vehesion thiab corrosion. Cov khoom no muab nws cov kev pabcuam ntev ntev hauv kev ua phem rau cov tub rog thiab txij li lub neej tsis muaj nqi
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