Lub cev muaj zog vibration yog ib qho ntawm cov kev ua haujlwm tam sim no ntawm cov motors.Yog li, koj puas paub vim li cas cov khoom siv hluav taws xob xws li lub cev muaj zog siv 50Hz alternating tam sim no tsis yog 60Hz?Qee lub tebchaws hauv ntiaj teb, xws li United Kingdom thiab United States, siv 60Hz alternating tam sim no, vim ...
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