DIN 7971-1952 带槽平圆头自攻螺钉
时间:2024-05-10 23:27:03 来源: 标准资料网 作者：标准资料网 阅读：9542
【英文标准名称】:Slottedpanheadtappingscrews
【原文标准名称】:带槽平圆头自攻螺钉
【标准号】:DIN7971-1952
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:J13
【国际标准分类号】:
【页数】:
【正文语种】:
MIL-G-25537C, MILITARY SPECIFICATION: GREASE, AIRCRAFT, HELICOPTER OSCILLATING BEARING, NATO CODE NUMBER G-366 (29 JUN 1984)., This specification covers the requirements for one grade of grease for use in aircraft bearings having oscillatory motion of small amplitude. This grease is identified by NATO symbol G-366 (see 6.5).【英文标准名称】:StandardTestMethodsforManganeseinWater
【原文标准名称】:水中锰的标准试验方法
【标准号】:ASTMD858-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:含量测定;锰;涂漆;涂料;测试;水
【英文主题词】:atomicabsorption;chelation;flame;graphitefurnace;manganese;water
【摘要】:Elementalconstituentsinpotablewater,receivingwater,andwastewaterneedtobeidentifiedforsupportofeffectivepollutioncontrolprograms.TestMethodsA,B,andCprovidethetechniquesnecessarytomakesuchmeasurements.Althoughinhaledmanganesedustshavebeenreportedtobetoxictohumans,manganesenormallyisingestedasatracenutrientinbothfoodandwater.Becauseitisconsideredtoberelativelynontoxictoman,aswellasaquaticlife,alimitof50x03BC;g/LhasbeenestablishedintheEPANationalSecondaryDrinkingWaterRegulations.Thislimitisbasedprimarilyonitsabilitytostainlaundryandproduceobjectionabletastesinbeverages.Manganesedoesnotoccurnaturallyasametalbutisfoundinvarioussaltsandminerals,frequentlyinassociationwithironcompounds.ManganeseisnotminedintheUnitedStatesexceptwhenmanganeseiscontainedinironoresthataredeliberatelyusedtoformferro-manganesealloys.Manganesesaltsareusedasfertilizeradditivesandarecommonlyfoundinsurfaceandgroundwaters.1.1Thesetestmethodscovertheatomicabsorptiondeterminationofdissolvedandtotalrecoverablemanganeseinwaterandcertainwastewaters.Threetestmethodsaregivenasfollows:TestMethodConcentrationRangeSectionsA-AtomicAbsorption,Direct0.1to5mg/L7to15B-AtomicAbsorption,Chelation-Extraction10to500g/L16to24C-AtomicAbsorption,GraphiteFurnace5to50g/L25to33