My job is to cut stencils and sort up mails.我的工作是刻蜡板和把来信分类.Stencils are available to aid in the construction of neat flow charts.型板用于帮助构成简洁的程序框图.She's worked with stencils before, so she'll be working in the he...
其它矿物: 毒砂 、 自然铋、辉铋矿 、 黝铜矿 、 汞等.Other minerals: Arsenopyrite, Native Bi , bismuthinite, tetrahedrite, Hg, etc.银形成于硫化物成矿后期的硫锑铅矿─方铅矿─ 黄铜矿 ─银黝铜矿阶段.The mineralization of silver at the late stage of formation of sulfides, i. e....