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The 2,6 dipicrylamino 3,5 dinitro pyridine(PYX)pureness reference material had been certificated by potentiometric method.

用电位滴定法2,6-氨基)-3,5-二基吡啶(PYX)质的纯度进行测定。

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frequency-converter, frequency-discrimination, frequency-doubled, frequency-locking, frequencyspectrometer, frequency-transformer, frequent, frequentation, frequentative, frequenter,

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3G, 401(K), a,

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