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Machine tool industry has improved in operation from January to March 2019, but the pressure is not reduced.
Machine tool industry has improved in operation from January to March 2019, but the pressure is not reduced.
2019/6/6   140

Affected by the high and low trend of the industry before 2018, the main economic indicators of the machine tool industry in the first three months of 2019 were generally low, but in March it has shown a clear improvement.

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This (original 104) 50 PCB circuit design production terminology you know how much
This (original 104) 50 PCB circuit design production terminology you know how much
2019/6/9   129

1, annular="" ring="" hole ring Refers to the copper ring that is flat on the surface of the board outside the wall of the through hole.

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