选择题：I tried to put______a telephone call to him, but his line was always busy.A over

题目分类：大学英语B级
题目类型：选择题
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题目内容：

I tried to put______a telephone call to him, but his line was always busy.

A over B into C away D through

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答案解析：

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

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．BC．CD．D

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