13.Esophageal barium meal examination showed visible esophageal smooth funnel-shaped narrow the application of spasmolytic agents will enable the expansion.
17.This paper establishes a global attractor of hemigroup produced by the initial boundary value problem of generalized convection and expansion equation.
20.Through the design and application of auto-deslagging unit,it solves many problems occurred in manual deslagging and ensure pipe ends expansion procedure go on smoothly.