What cause hypoxia?
A.Excessive carbon dioxide in the atmosphere.
B.An increase in nitrogen content of the air at high altitudes.
C.A decrease of oxygen partial pressure.
正确答案是C
What cause hypoxia?
A.Excessive carbon dioxide in the atmosphere.
B.An increase in nitrogen content of the air at high altitudes.
C.A decrease of oxygen partial pressure.
正确答案是C