Caij nplooj ntoos hlav
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High Quality Spring
Springyog ib qho khoom siv uas siv elasticity los ua haujlwm.Cov khoom ua los ntawm cov ntaub ntawv elastic deform nyob rau hauv qhov kev txiav txim ntawm sab nraud quab yuam, thiab rov qab mus rau lawv lub qub qub tom qab tshem tawm cov sab nraud rog.Kuj hu ua "caij nplooj ntoos hlav."
