9,9-二(4-羟乙氧基苯基)芴(BPEF)是合成聚酯聚醚重要的单体.采用9-芴酮和苯氧乙醇为原料,以浓硫酸作为催化剂,以少量巯基羧酸为助......

Background: The objective of this study is to determine whether analyze of the infant’s pain associated with diphtheria......