题目内容

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。()

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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。()

钢筋应力松弛是指钢筋受力后在长度不变的条件下，钢筋应力随时间的增长而降低的现象。()