In the course of designing and manufacturing chemical equipments and pressure pipelines,we can not take it for granted that the replacement of materials is just the replacement of low quality materials by high quality materials,the replacement of inferior materials by superior materials and the replacement of thin materials by thick materials.

Hefei should thread up the theme of "the great environment,the grand construction,and development",adapt the urban space development layout of "1-4-1",and carry out the policy of urban areas helping rural areas to.

The mechanism of urban areas helping rural areas has rich content,which means setting up the long stable urban-areas-guiding-rural-areas systems for fiscal transfer,factor conveyer,industry driving and function radiation in accordance with the objective requirements of market rule and economic development law through the system of reform and innovation.