... large span, and structural stability. 2) Also use few materials, and can be used several times that ... a long life-span up to 50years for use. At the same time, due to the materials ... 2)Type: Single slope, double slope, muti slope; Single span, double-span, Multi-span, single floor, double floors! 3) Base: ... into the country where the structure is planning to use? 7. If you have other requirements, such ...