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【单选题】
维持胸内负压的前提条件是A.
呼吸肌舒缩
B.
胸膜腔内存有少量液体
C.
呼吸道存在一定的阻力
D.
肺内压低于大气压
E.
胸膜腔是密闭的
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A.
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B.
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A.
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B.
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C.
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A.
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B.
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C.
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D.
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B.
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A.
use to
B.
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C.
used to
D.
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