The air entrainment for avoiding cavitation damage has been widely used in long free flow tunnels. It is crucial to determine whether an aerator is needed for s
前置胎盘60例临床分析张丽君,鹿敏,刘中娥(苍山县人民医院)1临床资料自1991年10月至1993年10月我院收治前置胎盘60例,占同期产科2340例的2.56%,20~49岁,其中24~30岁41例,占68.3%。初产妇11例,占18.3%,经产妇...
Clinical analysis of 60 c