心传导系统由( )、( )、( )、( )、( )构成。
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Spirometry is the measurement of
A. fetal head size
B. dimensions and capacity of the pelvis
C. volume of air inhaled or exhaled by the lung
D. cells in the blood
Dyspnea meansin breathing.
The termmeans abnormally rapid breathing.
The termmeans abnormally slow breathing.