【简答题】A.This effort will apprise land's use rights before contracting lease. B.Add to the State revenue. C.Improve the management of the land. D.Ensure the best use of land resources and control its redistr...
【简答题】一屋架有四根预应力筋,沿对角线分两批对称张拉,其程序为0→1.05 con (持荷2min)→σ con ,已知预应力筋为直径22mm的HRB400级冷拉钢筋(A r =380mm 2 ),试验测知第二批张拉对第一批所造成的预应力损失α E σ e =24.3 N/mm 2 ,求各批筋的张拉力,并对张拉方案进行校核。