单项选择题
判断呼吸衰竭的标准是:()。
A.PaO2<
B.0kPa;PaCO2<
C.67kPa
B.PaO2<
D.67kPa;PaCO2>8.0kPa
C.PaO2<8.0kPa;PaCO2>6.67kPa
D.PaO2<5.32kPa;PaCO2>6.67kPa
E.PaO2<4.0kPa;PaCO2<5.32kPa
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单项选择题
In _____, a small group of Puritans sailed from _____ in the Mayflower to be the first settlers in the New Land.
A.1620,
B.1620,
C.1720,
D.1720,
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单项选择题
面对不对称信息,下列哪项不能为消费者提供质量保证:()。
A.品牌
B.低价格
C.长期质量保证书
D.气派的商品零售处
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