当前位置:考试网  > 试卷库  > 技能鉴定  > 其他类  > 冶金工业技能鉴定  > LF冶炼过程温度控制原则是什么?
试题预览

LF冶炼过程温度控制原则是什么?

查看答案
收藏
纠错
正确答案:

(1)初期:以造渣为主。宜采用低级电压,中档电流加热至电弧稳定;

(2)升温:较高电压,较大电流;

(3)保温:采用低级电压,中小电流;

(4)降温:停电,吹氩

答案解析:

暂无解析

你可能感兴趣的试题

真空自耗电弧熔炼钛时,在一定的弧长(电极下端与熔池表面间的距离)范围内,弧长每变化10mm便会引起()的电压变化

后滑的金属流动速度比轧制速度()

“GB”是()的缩写代号

缓蚀剂的主要作用是避免过酸洗

一根重2600Kg规格为Φ600mm长2000mm的TC11的自耗电极,要化成Φ700mm的成品铸锭,铸锭补缩需要消耗自耗电极195Kg;,按工艺规定熔化结束跳闸时自耗电极剩余厚度为20mm。试计算开始补缩时行程为多少?

热门试题 更多>
试题分类: 网络安全素质教育
练习次数:14次
试题分类: 水利
练习次数:1次
试题分类: Python语言程序设计
练习次数:0次
试题分类: 软件测试技术
练习次数:0次
Thefoodweeatseemstohaveprofoundeffectsonourhealth.Althoughsciencehasmadeenormousstepsinmakingfoodmorefittoeat,ithas,atthesametime,mademanyfoodsunfittoeat.Someresearchhasshownthatperhapseightypercentofcancerisrelatedtothedietaswell,especiallycancerthecolon.Differentculturesaremorepronetocontractcertainillnessesbecauseofthefoodthatischaracteristicinthesecultures.Thatfoodrelatedtollnessisnotanewdiscovery.In1945,governmentresearchersrealizedthatitratesandnitrites,commonlyusedtopreservecolorinmeats,andotherfooddditives,causedcancer.Yet,thesecarcinogenicadditivesremaininourfood,nditbecomesmoredifficultallthetimetoknowwhichthingsonthepackginglabelsofprocessedfoodarehelpfulorharmful.Theadditiveswhichweeatarenotallsodirect.Farmersoftengivepenicillintobeefandpoultry,andbecauseofthis,penicillinhasbeenfoundinthemilkoftreatedcows.Sometimessimilardrugsareadministeredtoanimalsnotformedicinalpurposes,butforfinancialreasons.Thefarmersaresimplytryingtofattentheanimalsinordertoobtainahigherpriceonthemarket.AlthoughtheFoodandDrugAdministration(FDA)hastriedrepeatedlytocontroltheseprocedures,thepracticescontinue. 48.Whatisthemaintopicofthepassage? A.Foodandourhealth BFoodandadditives C.Foodandcancer DFoodandculture 49AllofthefollowingstatementsaretrueEXCEPT_______. AFortypercentofcanceriscausedbyproblemsrelatedtofood. BResearchershaveknownaboutthepotentialdangeroffoodadditivesformanyyears C.Weeatsomeofthefoodadditivesdirectlyandsomeindirectly DDrugsarealwaysgiventoanimalsformedicinalpurposes 50.Whydofarmersgivedrugstotheiranimals? A.tospeedupthegrowthofanimals BTomaketheanimalsfatter Ctomaketheanimals’meatfittoeat DTomaketheanimals’meatrichinnutrients 51.Itcanbeinferredfromthepassagethat_________. Ascientisthavemadeallthefoodfittoeat Bonlyinrecentyearshavepeoplefoundthatthefoodisrelatedtoone’sillness Callkindsofcancerarerelatedtothediet Dsomeadditivesareharmfultoourhealth 52.Theword“this”inthesecondsentenceofparagraph2mostprobablyrefersto__________. Afarmer Bpenicillin Cbeefandpoultry Dthefactthatfarmersoftengivepenicillintoabeef
试题分类: 英语B级
练习次数:0次
试题分类: 电气
练习次数:1次
试题分类: 电气
练习次数:0次
扫一扫,手机做题