In view of traditional shaft furnace process of sponge iron,the new viewpoint was put forward,in which sponge iron could be produced by non preinverting shaft furnace with coke oven gas other than natural gas.

Construction technology of cast-in-site nonprestressed super-thin arch roof truss;

In this paper,causes of nonprediction effects are discussed in chemical experiments and approaches of solving nonprediction and of promoting experiment efficency are proposed in the light of aforesaid ones.