Where does the axis must pass through if the moments of areas of section with respect to an axis is zero。（ ）
A: Centroid
B: Centroid of mass
C: Center
D: Any point
A: Centroid
B: Centroid of mass
C: Center
D: Any point
A
举一反三
- When member is subjected to the eccentric loads, the wrong description of neutral axis is ( ). A: The position of the neutral axis is independent of external forces and eccentricity B: The neutral axis and the point of the external force are on opposite sides of the cross section centroid respectively C: The neutral axis is related to the shape and size of the section D: The closer the external force point is to the centroid, the farther the neutral axis is from the centroid
- （）loaded columns, where the loads are applied at any point on the column section, causing moments about both the x axis and y axis simultaneously
- An ideal column is ( ) , made of ( ) material, and the load is applied through the ( ) of the cross section. A: initially perfectly straight, homogeneous, centroid B: perfectly straight, nonhomogeneous, centroid C: initially straight, homogeneous, any point D: straight, nonhomogeneous, centroid
- The area of section is A, the centroid is C and the moment of inertia of section with respect to the z axis is[img=14x22]1803a25ae5167bc.png[/img] , then [img=21x22]1803a25aee78117.png[/img] is .[img=185x110]1803a25af82e370.jpg[/img] A: [img=55x26]1803a25b03408a9.jpg[/img] B: [img=99x21]1803a25b0d903ef.jpg[/img] C: [img=71x53]1803a25b1883f79.jpg[/img] D: [img=85x56]1803a25b22f93d9.jpg[/img]
- The three hinged arch designed according to the rational arch axis can make the bending moment of each section in the arch zero under any load. A: 正确 B: 错误
内容
- 0
_______ indicates that the zero,Y,Z return is over for the respective axis X.
- 1
If the section figure has a symmetry axis, then for the figure ( ) to its symmetry axis. A: Both the static moment of inertia and the moment of inertia are not zero; B: Both the static moment of inertia and the moment of inertia are zero; C: The static moment of inertia is not zero, the moment of inertia is zero; D: The static moment of inertia is zero, the moment of inertia is not zero.
- 2
纵、横坐标轴采用等长刻度的命令是 A: axis square B: axis auto C: axis equal D: axis off
- 3
以下属于坐标轴控制的命令的是？ A: axis auto B: axis tight C: axis fill D: axis ij
- 4
The section which is cross to optical axis of anisotropic mineral has no pleochroism and absorption.