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(1) When performing a ring (coin tap) test on composite structures, a change in sound may be due to damage or to transition to a different internal structure.
(2) The extent of separation damage in composite structures is most accurately measured by a ring (coin tap) test.
Regarding the above statements,
| | A) both No. 1 and No. 2 are true. |
| | B) only No. 1 is true. |
| | C) only No. 2 is true. |
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