通常用纵波直探头测试的第几次与第一次底面回波幅度所差的分贝数表示。
It is usually expressed by the decibels which is the straight beam probe tested the second time subtracting from the first bottom surface echo amplitude.
通常用纵波直探头测试的第几次与第一次底面回波幅度所差的分贝数表示。
It is usually expressed by the decibels which is the straight beam probe tested the second time subtracting from the first bottom surface echo amplitude.
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