好像没有什么副作用，生小孩都要做ultrasound

来源: 汉语能力 于 2012-01-30 08:00:03 [] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (336 bytes)
回答: 请问ultrasound humidifier 有无副作用多谢 由 leappad 于 2012-01-30 07:42:11

Occupational exposure to ultrasound in excess of 120 dB may lead to hearing loss. Exposure in excess of 155 dB may produce heating effects that are harmful to the human body, and it has been calculated that exposures above 180 dB may lead to death

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