斯佩罗先生不愿意寻求帮助。Mr Spero was reluctant to ask for help.鹰从不成群结伙 —— 你一次只能见到一只. --H? 罗斯?佩罗.Eagles t flock - your have to find them one at a time . -- H . Ross Perot....
起泡剂是能够发生化学反应并产生气体的物质.Foaming agent is a chemical reaction can occur and produce gases.运用GC-MS剖析两起由起泡剂引发的选矿事故.Two mineral processing accidents resulted from frothers are analyzed by means of GC - MS....