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【单选题】
正常情况下，维持呼吸中枢兴奋性的最有效刺激是A.
一定程度的缺氧
B.
血中氢离子浓度升高
C.
一定浓度的二氧化碳
D.
其他三项都不是
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A.
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B.
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C.
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D.
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B.
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C.
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D.
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A.
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C.
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D.
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【单选题】除了外汇汇率外，银行外汇牌价还标出现钞汇率。这两者之间的关系是( )。
A.
现钞买入价等于外汇买入价，现钞卖出价低于外汇卖出价
B.
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C.
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