YY T 0865.2-2018 超声 水听器 第2部分：40MHz以下超声场用水听器的校准.pdf

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YY T 0865.3-2013 超声 水听器 第3部分：40 MHz以下超声场用水听器的特性.pdf

YY T 0865.3-2013 超声水听器第3部分：40MHz以下超声场用水听器的特性.pdf

YY T 0865 2-2018 《超声 水听器 第2部分：40MHz以下超声场用水听器的校准》.pdf

YY T 0865.2-2018 超声 水听器 第2部分：40MHz以下超声场用水听器的校准.pdf

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