皮皮学，免费搜题
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【单选题】
输液中发生空气栓塞，导致患者死亡的主要原因是A.
气泡栓塞大脑中动脉
B.
气泡阻塞上腔静脉
C.
气泡阻塞主动脉口
D.
气泡阻塞肺动脉口
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反馈参考答案：
举一反三
【单选题】预防压疮发生的错误方法是
A.
鼓励和协助卧床病人经常更换卧位
B.
翻身时注意避免拖、拉、推等动作
C.
定期用30%乙醇按摩受压部位
D.
对使用夹板的病人要检查位置是否适当
E.
保持皮肤清洁干燥，避免潮湿、摩擦、尿便等刺激
【单选题】A data set that consists of observations on a variable or several variables over time is called a _____ data set.
A.
binary
B.
cross-sectional
C.
time series
D.
experimental
【判断题】A cross-sectional data set consists of observations on a variable or several variables over time.
A.
正确
B.
错误
【简答题】A set of data consists of 38 observations. How many classes would you recommend for the frequency distribution?
【简答题】A data set consists of 83 observations. How many classes would you recommend for a frequency distribution?
【单选题】A data set consists of 145 observations that range from 60 to 460, the number of classes should be ( ) for a frequency distribution.
A.
6
B.
7
C.
8
D.
9
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