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【单选题】
直径d=25 mm的钢，受轴向拉力60 kN 作用时，在标距为200 mm的长度内伸长了0.113mm。 当其承受一对扭转外力偶矩M=0.2 kN∙m 时，在标距为200 mm的长度内相对扭转了0.732°的角度。则的弹性常数E、G 和v分别为多少。A.
216GPa, 81.72GPa, 0.32
B.
200GPa, 81.72GPa, 0.32
C.
216GPa, 60GPa, 0.32
D.
216GPa, 81.72GPa, 0.2
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