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【多选题】
关于单层厂房安装前的准备工作，以下说法不正确的是（）。A.
钢筋混凝土构件在运输时的混凝土强度不应高于设计规定的强度
B.
运输道路应有足够的转弯半径
C.
构件在安装后构件表面上弹出中心线
D.
较长而重的构件应根据运输方向确定装车方向
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