However, the crack detection rate and reliability of these methods need further study.

但是，这些方法的裂纹检出率和可靠性需要深入研究。

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The reliability of the two methods are certified by result of experiment.

实验结果证明了这两种方法的可靠性。

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The reliability of the two methods are certified by result of experiment.

实验结果证明了这两种方法的可靠性。

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