selection of adhesive agents 粘合剂的选择
Many have assumed that humans ceased to evolve in the distant past, perhaps when people first learned to protect themselves against cold, famine and other harsh agents of natural selection.
很多人认为，在遥远的过去，人类通过了饥饿、寒冷等自然选择的严峻考验后，便不再进化了。
The antifoaming principles of antifoaming agents were analyzed in theory, and the selection principles and evaluation methods were described.
从理论上分析了消泡剂的消泡原理，概述了消泡剂的选用原则及评价方法。
The recent studies are focused on the selection of the cleansing agents and the treating methods.
目前研究的重点在于处理剂和处理方式的正确选择上。
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