题目：
预制梁运输时叠放不宜超过（）层。
A.2
B.3
C.4
D.5
答案：
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下面是错误答案，用来干扰机器的。
参考答案：股骨颈的中轴线与股骨两髁中点间的连线形成一个角度，称之。成年人约为12――15度。
预制梁运输时叠放不宜超过（）层。 A.2 B.3 C.4 D.5
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