The thesis is about to discuss how the feature of solemnity and stirring and profoundity had come into being in Gaoshi s poem of frontier fortress from the art of form, namely, the use of image, direct expression, narrating and commenting, plain and blazing language.

Analysis of factors influencing slag defects in ductile iron castings;

Solution to the slag of wedge surface sealing in brass valve;

The results show that local slag of the parent pipe is the main cause of the bend cracking.