Yingchangpo silver deposit of Guizhou is an Ag_Pb_Zn polymetallic deposit that approaches middlescale.
贵州银厂坡银矿床属银铅锌多金属矿床,其规模近于中型。
2
The manufacture of vanillin from guaiacol and glyoxylic acid was investigated in middlescale production.
对愈疮木酚和乙醛酸缩合—氧化合成香兰素路线进行了中等规模的研究。
3
Recent years' geological exploration has confirmed that the proved copper reserves in Dabaoshan copper(silver) polymetallic ore field has reached middlescale.