Mineral exploration made important progress in .coal, uranium, iron, gold, silver, copper, nickel, zinc, lead, antimony, tungsten, molybdenum, vanadium, kainite and characteristic non-metal.
Columbia University researchers using this machine found the vapor has toxic metals like chromium, nickel, zinc and lead and as we know, there's no safe level of lead.
、
、
、钨、钼、
、钾盐
非金属矿产等方面取得重要进展。
9
集
了气雾中含有有毒金属，例如铬、镍、锌、铅，而我
，只要含铅就是危险的。
