【单选题】【消耗次数：1】
一横截面为正方形砖柱分上、下两段，如图所示，已知P=40KN，则荷载引起的最大工作应力为（ ）MPa。<img src="20200804/1596522990227100.png" title="1596522990227100.png" alt="图片5.png"/>
①
0.88
②
0.78
③
0.69
④
0.96
参考答案：
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