固体物质受到外力拉伸时 产生应变 外力必对固体做功 其结果是： When a solid material is stretc
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固体物质受到外力拉伸时，产生应变，外力必对固体做功，其结果是： When a solid material is stretched by an external force, it will produce strain, and the external force must do work on the solid. The result is as follows,
A．做功变为固体势能的增加 Work becomes an increase in the potential energy of a solid
B．做功变为热 Work becomes heat
C．做功使功能增大 Work increases function
D．使固体运动 To cause a solid to move
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变为固体势能的增加