A. 只要原型与模型雷诺数相等，即自动相似的区域
B. 只要原型与模型弗劳德数相等，即自动相似的区域
C. 处于紊流光滑区时，两个流场的雷诺数不需要相等即自动相似的区域
D. 在紊流粗糙区，只要满足几何相似及边界粗糙度相似，即可自动满足力学相似的区域
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