The change law of the function cannot be quantitatively expressed by the isosurface of the objective function.()
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The basic idea of numerical iterative method are______ ,______ and______ .
压杆的局部削弱不会影响压杆的稳定性,也不会影响压杆的强度。()
由单根槽钢制成的梁发生平面弯曲时,梁上外力的作用线,除过要和梁的截面形心主惯性轴平行外,外力作用线还要经过截面的弯曲中心。( )