欺骗手段
发表于 2025-3-23 10:42:48
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Lipoma
发表于 2025-3-23 15:59:29
Defining the strategic businessesThe determination of tungsten in molybdenum is a complex analytical problem. In order to separate the metals the molybdenum is precipitated by hydrogen sulfide in the presence of tartaric acid. The tungsten is determined in the filtrate . If there is only a little tungsten present the error is considerable.
好忠告人
发表于 2025-3-23 21:58:27
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荒唐
发表于 2025-3-23 23:08:34
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Bombast
发表于 2025-3-24 04:32:39
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宫殿般
发表于 2025-3-24 07:27:20
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semble
发表于 2025-3-24 12:13:05
,High-Temperature Oxidation Resistance of Refractory Silicon Nitride—Silicon Carbide Materials,Silicon nitride and carbide are promising materials for use as refractories; they are highly resistant to mineral acids and alkalis, have a high melting point, and are thermally very stable .
expound
发表于 2025-3-24 18:24:58
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IVORY
发表于 2025-3-24 22:24:01
Some Data Relating to the Chemical Properties of Germanides,Published data relating to the chemical properties of metal germanides are very limited. The germanides of the alkali metals have been studied most completely. Thus lithium germanides of the following compositions are known: Li.Ge and Li.Ge.. These decompose in damp air, forming Li.CO.; Li.Ge is more active .
女歌星
发表于 2025-3-25 01:09:12
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