When emulsions were fogged by (1) a small amount of thiourea dioxide and goldsalt, fog centers distributed on the grain surface and sub-surface;
当二氧化硫脲量小,加金灰化时,灰化中心分布在颗粒表面和次表面;
2
It is the world's top producer of cadmium, gold, indium, iron ore, lime, lead, manganese, mercury, molybdenum, phosphate, salt, tin, tungsten, vanadium and zinc.