單項(xiàng)選擇題先張法施工中,鋼絲的預(yù)應(yīng)力值偏差不得大于或小于設(shè)計(jì)規(guī)定相應(yīng)階段預(yù)應(yīng)力值的()

A.4%
B.5%
C.6%
D.7%