问题
单项选择题
图示结构杆①的轴力为（）
A.拉力
B.压力
C.零
D.不能确定
答案
参考答案：B
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图示结构杆①的轴力为（）
A.拉力
B.压力
C.零
D.不能确定
参考答案：B
| 根据对话情景选择恰当的选项，其中有两项是多余的。 | |
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