brachytherapy 发表于 2025-3-21 20:04:03

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macular-edema 发表于 2025-3-22 00:17:09

Other Methods for Transmitting and Receiving Ultrasoundompared with the piezoelectric oscillator, which is coupled to the workpiece, the surface of the work piece forms in the case of these “direct” methods a part of the acoustic transducer. The direct or dry methods thus require no coupling medium, so avoiding some of the difficulties analysed in the next paragraph.

意外 发表于 2025-3-22 01:26:09

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吗啡 发表于 2025-3-22 05:54:47

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forbid 发表于 2025-3-22 12:24:44

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使腐烂 发表于 2025-3-22 16:27:57

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Insulin 发表于 2025-3-22 18:41:30

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山羊 发表于 2025-3-22 23:47:43

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trigger 发表于 2025-3-23 03:06:32

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Reverie 发表于 2025-3-23 07:46:14

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查看完整版本: Titlebook: Ultrasonic Testing of Materials; Josef Krautkrämer,Herbert Krautkrämer,Werner Grabe Book 19772nd edition Springer-Verlag Berlin Heidelberg