2. direct the white markings are not caused by slow crack is the last section, but since it had occurred before the cracks and then inside the workpiece. What makes us aware that there is a crack in the previous test, we've put it to make a small crack first, then put it to the test result is directly over a small crack in the first episode, causing white dots white spots, but it will not result in all parts of the work will occur just where we make the crack.
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