题目内容

Statically determinate structures must have deformation if there is displacement.

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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（）