11 在平面應力條件下，σx=-40 MPa，σy=10 MPa 且一主應力σp 為 8 MPa；則其|τxy |之大小為？（各項應力正值之定義）【題組】12 承上題，另一主應力為：(A)-45

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11 在平面應力條件下，σx=-40 MPa，σy=10 MPa 且一主應力σp 為 15.8 MPa；則其|τxy |之大小為？（各項應力正值之定義）

12 承上題，另一主應力為：
(A)-45.8 MPa
(B)-34.2 MPa
(C) 14.2 MPa
(D) 65.8 MPa

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