Polysonics(宝丽声)超声波流量计
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Polysonics ISTT-P 夹合式超声流量计
NPR's Melissa Block talks with Nathan Erwin, an entomologist at the Smithsonian's Museum of Natural History and Scott Harvey, an acoustical consultant with the company Polysonics, who has measured the noise levels of the cicada ruckus.
NPR: Roar of the Cicada
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