搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1型题

下列呼吸衰竭患者中，属于机械通气适应证的是（）

A.意识障碍，呼吸不规则

B.全身状态较差，疲乏明显者

C.严重低氧血症或（和）CO潴留，达危及生命的程度（如PaO2≤45mmHg，PaCO≥70mmHg）

D.以上都是

答案

参考答案：D

填空题

语法填空

     Good morning! Now let me report the discussion work in our group. Wu Jun cleans up rooms (1)          weekends and Jia Mei likes cooking dinner with her mum. Wang Ping sometimes (2)           (wash) clothes for her family. As for me, I

usually help my father water the flowers.In my opinion, it is necessary (3)           us students to do some housework by

doing it, we can help our parents and understand them better. We'll also learn to take care of(4)           . Besides, we can

relax ourselves from hard work and develop our abilities.That's all. Thanks for (5)          (listen)!

1. _____ 2. _____ 3. _____ 4. _____ 5. _____
查看答案
单项选择题

关于位移和路程，下列说法中正确的是：（）

A.位移的大小可以大于路程

B.位移的大小只能小于路程

C.位移是矢量，描述质点位置的变化；路程是标量，描述质点的运动轨迹长度

D.位移的大小可能大于路程
查看答案