单项选择题

下列关于肺底部分的通气血流配比值的大小可能是( )

A．1.0
B．2.0
C．3.0
D．0.64
E．0.84

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将工件加热到适当温度，根据材料和工件尺寸采用不同的保温时间，然后进行缓慢冷却的热处理工艺是。
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A child has fever and malaise but minimal sputum production. The total leukocyte count is not markedly elevated. Mycoplasma pneumoniae is cultured from the nasopharynx. Which of the following histologic patterns is most likely to be found in his lung?

A．Alveolar neutrophilic exudates
B．Interstitial mononuclear cell infiltrates
C．Hayline membrane formation
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