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【单选题】
慢性肺心病病人体内长时间CO 2 潴留，若吸入纯O 2 可致呼吸暂停。原因是这种病人呼吸中枢兴奋性的维持主要依靠A.
高CO 2 刺激外化学感受器
B.
高CO 2 刺激中枢化学感受器
C.
缺O 2 刺激外化学感受器
D.
缺O 2 刺激中枢化学感受器
E.
缺O 2 直接刺激呼吸中枢
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举一反三
【单选题】Economics proceeds by making models of ( ), which are simplified representations of reality.
A.
social phenomena
B.
people’s imagination
C.
stories
【单选题】Economics models __________________.
A.
are used as detailed representations that include all aspects of an environmental issue
B.
can be useful for creating solutions to environmental problems if the assumptions are accurate
C.
are likely to produce the same conclusions about environmental issues despite changes in the model's assumptions
D.
can be used to create accurate and concise representations of environmental problems
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