[单选题]下列关于通气/血流比值的描述，哪一项是不正确的？

A、安静时正常值为0.85
B、通气/血流比值减小，意味着生理无效腔增大
C、肺尖部增大可达3
D、肺下部部分血液得不到充分气体交换，比值减小
E、肺动脉栓塞时，比值增大

参考答案： B

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