the changeover efficiency of crystal silicon is tall, usable floor area is small, use in housetop to have an advantage very much.
晶体硅的转换效率高,使用面积小,用在屋顶非常有优势。
were it not for the high compressive strength of modern structural materials, the area of the columns would encroach on the usable floor area to the point where this might become nil.
如果不是因为现代化结构材料具有很高的抗压强度,柱子的横截面积就会大到占去全部可用地板的面积。
it is the key for the reduction of construction initial energy use to reduce the embodied energy intensity and quantity in per usable floor area of the main materials.
降低主要建筑材料的内含能量强度值和单位建筑面积内建筑材料的使用量,是降低施工初始能耗的有效途径。
besides low-rent housing built by public sector, the new rules will also cover that of private sector, with per-capita usable floor area up to 16 m2 from 8 m2.