MEI Shi - long , 1991 . Middle and Late Cambrian conodont and trilobite biostratigraphy in Wanxian, Hebei . Unpublished Ph. D thesis of Peking University.武桂春, 2003. 鲁西地区晚寒武世牙形石. 北京大学博士研究生学位论文....an unpublished PhD thesis...
Antacids are alkaline and they relieve pain by neutralizing acid in the contents of the stomach.抗酸剂是碱性的,通过中和胃容物中的酸来减轻疼痛。Too much reliance is placed on antacids.人们过分依赖抗酸剂.Aluminum - containing antacids bind phosphate, mak...