题目内容
若要在保持截面积不变的条件下,提高正方形截面(宽度为a)梁的抗弯能力,则可以采取以下哪些措施()。
(1)改为圆形截面;
(2)改为高度大于宽度的矩形截面;
(3)改为工字形截面(翼缘宽度为a);
(改为箱形截面(外侧宽度为a)。
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