In the circuit board industry, the circuit boards with a thickness of 105 um or more are usually called thick copper boards. At present, the thick copper foils mainly used for printed circuit boards are 3 ounces, 4 ounces, 5 ounces, 6 ounces, and sometime
It can be used not only as a classroom teaching demonstration, but also as the examination of corresponding certificates such as radio debugging workers.
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