题目内容：
桁架结构全由三角形组成，接头均为旋转接头，称为铰接。大跨度建筑物的屋顶、大型桥等，常采用桁架结构。以下桥梁中采用桁架结构的是（）A．A
B．B
C．C
D．D
参考答案：
单选：桁架结构全由三角形组成，接头均为旋转接头，称为铰接。大跨度建筑物的屋顶、大型桥等，常采用桁架结构。以下桥梁中采用桁架结构的是（）A．AB．B
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A．A
B．B
C．C
D．D
A．A
B．B
C．C
D．D
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