题目内容

倒梁法适用于地基土比较均匀，上部结构刚度较大，荷载分布均匀，条形基础的高度不小于1/6柱距的情况。满足上述条件的条形基础内力按弹性地基梁计算。()

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相对受压区高度ξ与配筋率ρ的大小有关。一般地，ρ越大，ξ越小。()

简述过渡时期总路线的必然性。

"Skinner Box"
Now listen to part of a lecture in a psychology class. The professor is discussing the Skinner Box.
Question
Using the main points and examples from the lecture, describe the Skinner Box, and then explain how the device is used in psychology experiments.
Preparation Time:20 seconds
Recording Time:60 seconds

后张法是在浇灌混凝土并结硬后张拉预应力钢筋。()