题目内容：
胸内负压形成的主要原因是
A．肺回缩力 B．肺泡表面张力
C．气道阻力
D．吸气肌收缩
E．呼气肌收缩
参考答案：
答案解析：
单选题：胸内负压形成的主要原因是
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B．肺泡表面张力
C．气道阻力
D．吸气肌收缩
E．呼气肌收缩
B．肺泡表面张力
C．气道阻力
D．吸气肌收缩
E．呼气肌收缩
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