【单选题】If the PCO 2 of alveolar air was 50 mmHg and the PCO 2 of the blood entering the pulmonary capillaries was 46 mmHg, how will CO 2 move as the blood flows through the lungs?
A.
CO 2 would move from the alveoli into the pulmonary capillary
B.
CO 2 would move from the pulmonary capillary into the alveoli
【单选题】The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infinity and doom. On the contrary, demographic history offers evidence ...
A.
Human population expands at an exponential rate.
B.
Population growth has shown fluctuation in demographic history.
C.
Population growth can not be regarded as a social failure.
D.
Increase in population is related to productivity.
【单选题】The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infinity and doom. On the contrary, demographic history offers evidence ...
A.
Human population expands at a straight upward trend.
B.
Population growth has shown ups and downs in demographic history.
C.
Population growth can not be regarded as a social failure.
D.
Increase in population is related to productivity.
【单选题】The growth of population during the past few centuries is no proof that population will continue to grow straight upward' toward infinity and doom. On the contrary, demographic history offers evidence...
A.
Human population expands at a straight upward trend.
B.
Population growth has shown ups and downs in demographic history.
C.
Population growth can not be regarded as a social failure.
D.
Increase in population is related to productivity.
【单选题】The growth of population during the past few centuries is no proof that population will continue to grow straight upward toward infinity and doom. On the contrary, demographic history offers evidence ...
A.
Human population expands at a straight upward trend.
B.
Population growth has shown ups and downs in demographic history.
C.
Population growth can not be regarded as a social failure.
D.
Increase in population is related to productivity.