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GB/T 11904-1989
Water quality--Determination of potassium and sodium--Flame atomic absorption spectrophotometry
GB/T 11905-1989
Water quality--Determination ofcalcium and magnesium--Atomic absorption spectrophotometric method
GB/T 11906-1989
Water quality--Determination of manganese--Potassium periodate spectrophotometric method
GB/T 11907-1989
Water quality--Determination ofsilver--Flame atomic absorption spectrophotometric method
GB/T 11908-1989
Water quality--Determination of silver--Spectrophotometry with cadion 2B
GB/T 1804-2000
General tolerances--Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 5290.1-2001
电火花成形机 参数 第1部分:单立柱机床（十字工作台型和固定工作台型）
Diesinking electro-discharge machines(EDM)--Parameters--Part 1:Single column machines(cross slide table type and fixed table type)