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单项选择题
As shown in the figure, the cantilever beam with constant section is subjected to a concentrated force and a concentrated couple. If the maximum normal stress and the maximum shear stress at cross section C are σ and τ respectively, the maximum normal stress and the maximum shear stress at cross section A are ( ).
As shown in the figure, the cantilever beam with constant section is subjected to a concentrated force and a concentrated couple. If the maximum normal stress and the maximum shear stress at cross section C are σ and τ respectively, the maximum normal stress and the maximum shear stress at cross section A are ( ).
A、
and τ ;
B、
and 2τ ;
C、2
and τ ;
D、0 and τ .
