Gerdau S/A Ord-1.30% R$42.68B ...

Chrome is almost a synonym of the Internet. The browser developed at Mountain View, officially launched in 2008, is already the web browser par excellence on both desktop and laptop computers, as well ...

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The content of hexavalent chromium in industrial wastewater cannot exceed 0.5ppm.Since 2008, it has been stipulated that electrical and electronic equipment must not contain hexavalent chromium. The ...

The boron content in seawater is generally around 5ppm. In some European sea areas, the boron content in seawater can even be close to 10ppm. Although RO reverse osmosis can reach a maximum rejection ...