The formula of wedge angle is deduced under the condition of two-beam interference.
在考虑双光束干涉的情况下，导出测量平板楔角的公式；
Then, a two bode shallow beam element with twelve degree of freedom is established.
由此我们建立了二节点、十二个自由度的曲梁单元。
Imagine two people watching a beam of light.
设想有两个人在观察一束光。
Imagine two people watching a beam of light.
设想有两个人在观察一束光。
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