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【单选题】
In the immersion technique, the distance between the face and transducer and the test surface (water path) is usually and just so that the time required to send the sound beam through the waterA.
Is equal to the time required for the sound to travel through the test piece
B.
Is greater than the time required for the sound to travel though the test piece
C.
Is less than the time required for the sound to travel though the last piece
D.
None of the above
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