pureness

1.Fling yourself into nature, breathe the pureness and limpidity, you can spread yourself in the silent sunshine every day.

每一天，投入自然怀抱，呼吸纯净和清，静阳光里自由舒展。

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

用电位滴定法对2，6-双（苦氨基）-3，5-二硝基吡啶（PYX）标准物质纯度进行测定。