两根梁尺寸,受力和支承情况完全相同,但材料不同,弹性模量分别为 E 1 和 E 2 ,且 E 1 =7 E 2 ,则两根梁的挠度之比 y 1 / y 2 为:
A.
1 / 14 ;
B.
1 / 7 ;
C.
1 / 49 ;
D.
1 / 7 1/2 ;
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