一直径 d=18mm 的等截面直杆, 杆长为 800mm ,受静拉力 F=36kN ,杆材料的屈服点 s s =270Mpa , 取安全系数 [S] s =1.8 , 则该杆的强度 _______ 。
A.
不足;
B.
刚好满足要求;
C.
足够。
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