一种情况是正负离子平衡问题，或比率问题。
One thing is the balance or ratio between positive and negative ions.
他们被浸没在正负离子溶于溶剂的电解液中。
And they're immersed in an electrolyte made of positive and negative ions dissolved in a solvent.
通过对正负离子质谱的分析，可以确定岩样的化学组成。
With analysis of the spectra, the compositions of the samples can be determined.
以聚乙烯吡啶的化学反应制备了含正负离子对结构单元的两性聚合物CAPVP。
In this paper the chemical reaction of poly (vinyl pyridine) was studied and the polyelectrolytes CAPVP containing zwitterion structure units were synthesized.
空调办公环境的照度、正负离子评价指数及细菌总数均低于自然通风办公环境（P< 0.01）；
The illumination, assessment index of positive and negative ions and total bacteria in office with air-conditioner were lower than those of natural ventilation office (P< 0.01).
以SDS和CTAB为例研究了正负离子表面活性剂混合体系的流变性质，探讨了流变性与相行为的关系。
The phase behavior and rheology (viscosity) of aqueous mixture of anionic and cationic surfactants (SDS and CTAB) are studied in this paper.
在自制的仪器上以脉冲激光溅射铁、钌、锇的三核羰基原子簇化合物，由原位质谱观察和分析溅射产生的正负离子。
Trinuclear carbonyl cluster compounds of Fe, Ru and Os were vaporized, ionized and dissociated by pulsed laser beam.
在自制的仪器上以脉冲激光溅射铁、钌、锇的三核羰基原子簇化合物，由原位质谱观察和分析溅射产生的正负离子。
Trinuclear carbonyl cluster compounds of Fe, Ru and Os were vaporized, ionized and dissociated by pulsed laser beam.
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