2. direct the white markings are not caused by slow crack is the last part.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 address.We have taken it to pieces, making it a small crack first, then put it to the test, the result is direct small cracks.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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