Of the three types of nicotine, researchers found that all the brands of e-liquid they tested were the strongest form - free-base nicotine that is easily absorbed by the body.
The essay discusses the application of acrylonitrile co-polymerization in acrylic fiber production through the analysis over the reaction of dynamics of free-base co-polymerization.
前言： 本文通过对自由基共聚反应动力学的分析，对丙烯腈共聚合反应在腈纶生产中的应用进行了讨论；
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The environment-friendly thixotropic antirust oil is composed of base oil and barium-free antirusting agent.