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At the end of the 19th century, Chicago completely transformed the way Americans eat, and the Union Stockyards on the South Side were the center of that revolution

According to GB/T1040.3 Plastic Tensile Performance Test, place the BOPP smoke film sample in the fixture of the electronic tensile testing machine, so that the longitudinal axis of the sample coincides with the line connecting the center of the upper and lower fixtures, and press the specified speed Carry out the test, after the sample breaks, read the required load and the corresponding elongation value between the marked lines

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