50. In negative-pressure breathing, inhalation results from
(A) using muscles of the lungs to expand the alveoli.
(B) relaxing the muscles of the rib cage.
(C) contracting the diaphragm.
(D) contracting the abdominal muscles.
(E) forcing air from the throat down into the lungs.
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題目解析 這道題目考察的是負壓呼吸的機制...
阿摩線上測驗
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