【单选题】【消耗次数：1】
当无效腔容量加倍而潮气量不变时，通气/血流比值的变化是（）
①
减小
②
不变
③
加倍
④
增大，但小于加倍
⑤
增加三倍
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相关题目
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潮气量为500ml，呼吸频率为16次/min，无效腔气量为150ml，肺泡通气量为
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2.4L/min
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4L/min
③
5.6L/min
④
6L/min
⑤
8L/min
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通气/血流比值是指（）
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每分肺通气量与每分肺血流量之比
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每分肺泡通气量与每分肺血流量之比
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每分最大通气量与每分肺血流量之比
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肺活量与每分肺血流量之比
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功能性余气量与肺血流量之比
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下列对通气/血流比值的描述，正确的是（）
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指每分通气量与每搏输出量的比值
②
在整个肺的平均比值为8.4
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比值增大时有利于肺换气
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人体直立时肺尖部比值较大
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比值变小意味着肺泡无效腔变大
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呼吸频率从12次/分增加到24次/分，潮气量从500ml减少到250ml，则
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肺泡通气量不变
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肺泡通气量减少
③
肺通气量增加
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肺通气量减少
⑤
肺泡通气量增加
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呼吸频率从12次/分增加到24次/分，潮气量从500ml减少到250ml，则
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肺泡通气量不变
②
肺泡通气量减少
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肺通气量增加
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肺通气量减少
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肺泡通气量增加
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so
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On entering the classroom, the students stood up and said, Good morning!
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On entering the classroom, the teacher was greeted by the students with Good morning!
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this
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that
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Which sentence is correct?
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To look at a map, the importance of this new railway will be seen.
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You have only to look at a map to see the importance of this new railway.
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actor
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Returning home from work, he saw supper waiting for him in the kitchen.
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