單項(xiàng)選擇題

圓形截面梁彎曲,若某橫截面上的最大正應(yīng)力為80MPa,則該截面距形心為高度處點(diǎn)的正應(yīng)力的值為()。

A.20MPa
B.40MPa
C.60MPa
D.160MPa

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