To deal this problem,the reverse channel decision for bilateral competing closed-loop supply chain with dominant retailer was studied based on non-cooperative game.

The paper briefly introduces three kinds of support patterns applied receding from eyeframe passageway in the fully mechanized coal face and their scope applied,merit and shortcoming separately,even putting forward how to make sure reasonable of pay and protect technique parameter according to the actual circumstance of tunnel in Pinggang coal mine.

Bolt support technology for large cross sectional equipment remove gateway and application;

The turn-over channel of turbine blade is an important part of the internal cooling structure of the turbine blade.