某轴心受压钢构件绕x轴和绕y轴属于同一条的柱子曲线（即ф-λ关系曲线或表格），则，两轴等稳定的条件是

A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/b353227b-7d4e-4de2-a220-66022198bf06.jpg"title="ex_1301401024514_0.jpg" alt="ex_1301401024514_0.jpg"/>

B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/8ae496e6-432c-43a3-86a3-9102860b8984.jpg"title="ex_1301402073120_0.jpg" alt="ex_1301402073120_0.jpg"/>

C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/b79bcb53-b39e-406f-b1d2-2a16cf655bd3.jpg"title="ex_1301402079790_0.jpg" alt="ex_1301402079790_0.jpg"/>

D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e6cdc944-a7ac-4682-80f7-1795de14c07c.jpg"title="ex_1301402082082_0.jpg" alt="ex_1301402082082_0.jpg"/>