單項(xiàng)選擇題根據(jù)《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》(GB50010—2002)的規(guī)定,對(duì)于鋼絞線,其張拉控制應(yīng)力限值一般為()fptk

A.0.5
B.0.6
C.0.75
D.0.85