试题与答案

正常肺静脉血流的多普勒频谱有什么特点() A.收缩期、舒张期各有一负向的峰 B.只有

题型:单项选择题

题目:

正常肺静脉血流的多普勒频谱有什么特点()

A.收缩期、舒张期各有一负向的峰

B.只有舒张期一个正向的尖峰波

C.收缩期、舒张期各有一正向的峰,后者大于前者

D.舒张期呈双峰、均正向

E.收缩期呈双峰,均为负向,无舒张期血流

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:2014年巴西世界杯唤起无数球迷的激情,同时点燃了“中国制造”的出口热情。表明文化与经济相互交融。A正确且符合题意;B、C正确但与题意无关,应排除;文化消费影响文化产业的发展而不能决定,D...

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