The frequency of ultrasound wave is typically ---?
AAbove 20,000 kHz
BBelow 20 kHz
CAbove 20 kHz
DBelow 2 kHz
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ജലത്തിലുള്ള സൂക്ഷ്മ ജീവികളെ നശിപ്പിക്കുന്നതിന് ഉപയോഗിക്കുന്നത് :