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问题:

Today,ultrasonic(超声的)wavesarebeingputtoworkinlaboratoriesandfactories.Ifanultrasoundgeneratorisplacedinaliquid,thewavesmovetheliquidbackandforthhundredsofthousandsoftimeseachsecond.Thiscausesmaterials

更新时间:2026-05-05 19:32:00

问题描述:

Today,ultrasonic(超声的)wavesarebeingputtoworkinlaboratoriesandfactories.Ifanultrasoundgeneratorisplacedinaliquid,thewavesmovetheliquidbackandforthhundredsofthousandsoftimeseachsecond.Thiscausesmaterials
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