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1. Phenomena There are scratches, scratches and other defects on the surface of the air duct machine.....
1. Phenomena There are scratches on the exterior of the air duct, and welding slag and flux are left.....
1. Phenomena The large side of the duct machine sinks to varying degrees, and the two sides (small s.....
1. Phenomena Rectangular duct machine is distorted, the four corners are not straight; circular duct.....
1. Phenomena The air duct is obviously not straight and unequal. 2. Cause analysis (1) The exterior .....
1. Phenomena The air duct machine is uneven in appearance, the diagonal line is not flat, the adjace.....
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