Hauj lwm lawm
Kev tsis
U-khob yog ib daim di ncauj, lub npe rau ntawm tus ntoo khaub lig qhov txawv "U" zoo li. Lawv yog siv rau ob qho tib si dynamic thiab zoo li qub daim ntawv thov. Lub "U" zoo energizes lub sealing daim di ncauj thaum daim ntawv thov siab nce.
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