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Displacement method establishes equations according to deformation conditions.（）

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The reciprocal law of work is only applicable to elastic systems

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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（）

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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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Displacement method establishes equations according to deformation conditions.（ ）

The reciprocal law of work is only applicable to elastic systems

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 ( )

Displacement method establishes equations according to deformation conditions.（）

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（）