A.长×宽
B.面积×密度
C.面积×密度×高度
D.2×(长+宽)
A.长×宽
B.面积×密度
C.面积×密度×高度
D.2×(长+宽)
A.角隅处
B.中心位置
C.截面中间
D.截面边缘
A.宽度的平方
B.高度的立方
C.高度的平方
D.宽度的立方
A.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959825603475.png">
B.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959825637757.png">
C.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959825692967.png">
D.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959825715685.png">
A.$\frac{\pi}{16}(D^4-d^4)$
B.$\frac{\pi}{16}\frac{(D^4-d^4)}{D}$
C.$\frac{\pi}{32}\frac{(D^4-d^4)}{D}$
D.$\frac{\pi}{16}\frac{(D^2-d^2)}{D}$
A.惯性矩减小一倍
B.惯性矩不变
C.惯性矩增加八倍
D.惯性矩增加四倍
A.I_z=I_a+I_b
B.I_z=I_a+I_b+2A(h/2)^2
C.I_z=I_a+I_b+Ah^2
D.I_z=I_a+I_b+2Ah^2
A.$A_s=\frac{M}{f_y\cdotz}$
B.$A_s=\frac{M}{f_y}$
C.$A_s=M\cdotf_y\cdotz$
D.$A_s=M\cdotf_y$
A.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959828111363.png">
B.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/170495982813419.png">
C.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959828155698.png">
D.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959828175385.png">