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A.(Iy)a=(Iy)b，(Iz)a＜(Iz)b

B.(Iy)a=(Iy)b，(Iz)a＞(Iz)b

C.(Iy)a＞(Iy)b，(Iz)a=(Iz)b

D.(Iy)a＜(Iy)b，(Iz)a=(Iz)b

正确答案是B

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