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In which of the following cases is the intrapulmonary pressure lower than atmospheric pressure when

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In which of the following cases is the intrapulmonary pressure lower than atmospheric pressure when breathing quietly

A.at the beginning of inspiratory

B.at the end of inspiratory

C.at the beginning of expiratory

D.at the end of expiratory

参考答案:

答案：at the beginning of inspiratory

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