Are there any special requirements for the working environment of the precious metal testing instruments? There are still some small demands. For example, some conditions such as temperature and humidity, etc., in order to prolong...
At the end of 2016, a documentary "I was repairing cultural relics in the Imperial Palace" was all over the north and south of the river. In April 29, 2017, the film won the fiftieth Houston International Film Festival docum...
One of the biggest highlights of copper metal and other metals is that it is a few metals that can be recycled 100% repeatedly. Moreover, there is no loss and effect on the quality and performance performance of the copper after r...