我国三种主要的特殊使用空域是什么？哪种空域具有最高限制？（What are the three main SUAs in China? Which SUA has the highest restriction?）
我国三种主要的特殊使用空域是什么？哪种空域具有最高限制？（What are the three main SUAs in China? Which SUA has the highest restriction?）
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