Objective To observe the clinical effect of PCEA on expulsive pains.
目的观察pcea用于分娩镇痛的临床效果。
The relationship between faults activity stage and hydrocarbon expulsive stage controlled the distribution, forming and destroy of oil and gas accumulation.
断层活动时期与源岩排烃期（油气源）的匹配关系，决定油气的分布层位及油气藏的形成与破坏。
A comprehensive MEDLINE (1970-december 2006) search of English literature was performed to identify articles on the medical expulsive therapy of ureteral calculi.
文献回顾的方式是在MEDLINE上搜寻1970年至2006年十二月止，所有以输尿管结石内科排出疗法为主的英文文献。
A comprehensive MEDLINE (1970-december 2006) search of English literature was performed to identify articles on the medical expulsive therapy of ureteral calculi.
文献回顾的方式是在MEDLINE上搜寻1970年至2006年十二月止，所有以输尿管结石内科排出疗法为主的英文文献。
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