22.某材料之體積彈性模數 K (Modulus of elasticity of volume)為 175 GPa，蒲松比  = 0.4，則此材料之剪力彈性模數 G (Modulus of elasticity in shear)應為：
(A)25.5 GPa
(B) 37.5 GPa
(C) 62.5 GPa
(D) 87.5 GPa

K=E/3(1-2蒲松比) E=105...