It is considered that the critical slope and steady slope can be formed forcondition 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。
2
Objective Observe the effect of simple closurefor the treatment of perforated duodenal ulcers and the efficacy of laparoscopic repair in the condition of modern medical treatment.