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（EMB145）什么时候两边的EMERGENCY RAM AIR口都打开？（）
- A、空中，两个组件活门指令性关闭，直流重要汇流条可用
- B、空中或地面，两个组件活门指令性关闭，直流重要汇流条可用
- C、空中，两个组件活门中的一个指令性关闭，直流重要汇流条可用
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