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【单选题】
患儿，男，6岁龄，因“咳嗽伴喘息1天”就诊，昨日郊游时突然出现喷嚏、流涕、咳嗽和喘息表现，进行性加重，无发热。查体：烦燥，气促，R55次/分，可见三凹征，双肺呼吸音下降，少许哮鸣音。血常规示：WBC 6.8×109/L，L71.2%，N24.8%，Hb116g/L，Plt333×109/L，CRP<1mg/L。胸片未见明显异常。以下哪项是引起患儿咳喘最可能的原因？A.
花粉过敏
B.
病毒感染
C.
细菌感染
D.
运动过度
E.
情绪激动
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【单选题】Which is the feature of “mass cooperation networks”?
A.
Mass cooperation networks were based on mutual trust
B.
Most mass cooperation networks were linked with oppression and exploitation.
C.
Mass cooperation networks quickened the pace of agricultural revolution.
【简答题】A．The mass production of steel caused a revolution in the industrial world. B．The mass production of steel caused a decline in the railroad industry. C．The mass production of steel caused an increase ...
【简答题】Tandem mass spectrometry
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