【单选题】【消耗次数：1】
在耳内镜中耳手术中，中耳粘膜的气体交换方式，下列哪项描述是准确的？
①
中耳粘膜通过主动运输方式进行气体交换
②
中耳粘膜的气体交换完全依赖于血液循环
③
中耳粘膜的气体交换主要依赖于咽鼓管的开放与关闭
④
中耳粘膜的气体交换是通过扩散作用实现的
⑤
中耳粘膜的气体交换速率不受外部气压变化的影响
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