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术前12h禁食、4h禁饮的主要目的是A．使消化道充分休息B．防止呕吐而引起吸人性肺炎或窒息C．减少术中

术前12h禁食、4h禁饮的主要目的是

A．使消化道充分休息

B．防止呕吐而引起吸人性肺炎或窒息

C．减少术中污染

D．防止术中排尿、排便

E．减少术后排便

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第2题

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第3题

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第4题

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第5题

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第6题

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第7题

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第8题

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第9题

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第10题

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