【多选题】下列对后张预应力施工时的表述错误的是( )。
A.
封锚混凝土的强度等级一般不低于结构混凝土强度等级的75%
B.
先浇混凝土后穿束时,浇筑后应立即疏通管道,确保其畅通
C.
曲线预应力筋或长度大于等于25m的直线预应力筋,宜在两端张拉
D.
预应力筋的张拉顺序,设计无要求时,可采取分批,分阶段对称张拉
E.
张拉控制应力达到稳定后方可锚固,预应力筋锚固后的外露长度不宜小于20mm
【单选题】According to the passage, Mathew Brady is remembered today because ______.
A.
he was a famous soldier
B.
he took war photographs
D.
he designed a portable camera
【单选题】When she (retires) in September 1989, (tennis champion) Christine Even was the (most famous) (woman athlete) in the United States.
【单选题】The town is notable for its beautiful scenery in winter.
【单选题】对于锥塞式锚具,锚固阶段张拉预应力筋的内缩量允许值是( )。
【单选题】对于( ),锚固阶段张拉预应力筋的内缩量允许值是5mm。
【单选题】个性活泼、温顺易于调教,既可陪伴长距离散步,也能长时间在家陪伴的犬适合()饲养
【单选题】个性活泼、温顺易于调教,既可陪伴长距离散步,也能长时间在家陪伴的犬适 合( )饲养。[单选题] *