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【单选题】
下列关于呼吸道的结构和功能的叙述错误的是A.
呼吸道以环状软骨为界分为上、下呼吸道
B.
上呼吸道的主要功能是对吸入气体进行加温、湿化和机械阻拦
C.
下呼吸道终止于呼吸性细支气管
D.
气管于隆凸处分为左、右主支气管
E.
黏液一纤毛运载系统和咳嗽反射均为上呼吸道的重要防御机制
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皮皮学刷刷变学霸
举一反三
【单选题】The professor uses the example of voting for political office in order to
A.
Demonstrate how people make big inferences based on body language even in a short amount of time
B.
Explain that people unconsciously vote for those who are the same gender as the voter
C.
Refute the claim that politicians have bad posture
【简答题】认识有待扩展和有待深化体现了真理的( )。
【单选题】听力原文：M: What's that book you just picked up? W: The sociology text Professor Smith uses in his course. M: You had better read it if you want to pass the course. Smith swears by it. W: But it costs 40 ...
A.
Because it's too expensive to buy it.
B.
Because she doesn't need it.
C.
Because she can't buy it everywhere.
D.
Because she has already got one.
【简答题】设 的联合密度函数为 , 求 与 中至少有一个小于 的概率.
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