在图示4种应力状态中,切应力值最大的应力状态是:() ["A","B","C","D"]
图示圆轴,固定端外圆上y=0点(图中A点)的单元体的应力状态是:() ["A","B","C","D"]
在图示xy坐标系下,单元体的最大主应力σ1大致指向:() ["第一象限,靠近x轴","第一象限,靠近y轴","第二象限,靠近x轴","第二象限,靠近y轴"]
梁的截面尺寸扩大一倍,在其他条件不变的情况下,梁的强度是原来的多少倍?() ["2","4","8","16"]
如图所示梁的剪力方程应分几段来表述?() ["4","3","2","5"]
股票市场上常提到“IPO”意思是()