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The rigid arm added to the primary structure of displacement method has the same function as a fixed end（）.

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Force method and displacement method are not only used for calculation of internal forces for statically indeterminate structures, but also for statically determinate structures（）

One of the necessary conditions for using the method of graph multiplication is ( )

A. the bending moment diagram is a straight line under unit load
B. the structure can be divided into straight members with uniform section
C. the flexural rigidity EI of all members is a constant and equal
D. a structure must be a statically determinate structure

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The law of reciprocal displacements is that the displacement caused by the second force in the direction of the first force is equal to the displacement caused by the first force in the direction of the second force.

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An actual truss has only axial forces, no bending moments and shear forces.

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The rigid arm added to the primary structure of displacement method has the same function as a fixed end（ ）.

Force method and displacement method are not only used for calculation of internal forces for statically indeterminate structures, but also for statically determinate structures（ ）

One of the necessary conditions for using the method of graph multiplication is ( )

The law of reciprocal displacements is that the displacement caused by the second force in the direction of the first force is equal to the displacement caused by the first force in the direction of the second force.

An actual truss has only axial forces, no bending moments and shear forces.

The rigid arm added to the primary structure of displacement method has the same function as a fixed end（）.

Force method and displacement method are not only used for calculation of internal forces for statically indeterminate structures, but also for statically determinate structures（）