Flagstone. Use as stepping stones for pathways or for steps.板石. 用作通道或台阶的踏脚石.Please kindly inform us of the use and dimension of the flagstone you ordered.麻烦您告知我你需要的这个石块的用途以及您要的尺寸的大小....
任选的是, 可用加氢催化剂将纯化的二聚异丁烯加氢生成异辛烷.Optionally, the purified diisobutylene may be hydrogenated to isooctane hydrogenation catalyst.应用正碳离子聚合的方法合成新型聚异丁烯遥爪预聚物.The new telechelic prepolymers of polyisobutylene have been synthesize...