It is considered that the critical slope and steady slope can be formed for condition of characteristic flow during river closure of main channel.
认为在三峡大江截流特定的水流条件下，可以形成临界坡度和稳定坡度两种坡度。
Objective Observe the effect of simple closure for the treatment of perforated duodenal ulcers and the efficacy of laparoscopic repair in the condition of modern medical treatment.
目的观察单纯修补术治疗十二指肠溃疡穿孔的长期疗效以及腹腔镜下穿孔修补的效果。
Objective Observe the effect of simple closure for the treatment of perforated duodenal ulcers and the efficacy of laparoscopic repair in the condition of modern medical treatment.
目的观察单纯修补术治疗十二指肠溃疡穿孔的长期疗效以及腹腔镜下穿孔修补的效果。
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