Physical aging occurs when bicarbonate in the blood decreases. 物理老化發(fā)生時(shí)，碳酸氫根在血液中減少。
The physical aging was introduced to the polymer's poling process and the effect of aging time was investigated in this article. 摘要將聚合物的物理老化引入到極化過(guò)程中，并研究了不同溫度下的老化對極化聚合物取向穩定性的影響。
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