动脉导管未闭有显著肺动脉高压时可出现（） A.头面部青紫 B.上_爱下问搜题

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问题单项选择题

动脉导管未闭有显著肺动脉高压时可出现（）

A.头面部青紫

B.上半身青紫

C.全身青紫

D.末梢青紫

E.下半身青紫

答案

参考答案：E

单项选择题

梦境在( )开始出现。

A．睡眠初期
B．睡眠中期
C．睡眠晚期
D．快速眼动睡眠阶段

填空题

Questions 14-18

·Using, the information in the text, complete each sentence 14-18 with an expression from the list below.
·For each sentence (14-18). mark one letter (A-G) on the Answer Sheet.
·Do not mark any letter twice.

A. time zones
B. natural light
C. protection
D. discomfort
E. cost
F. essentials
G. motion sickness

When traveling by plane you plane you may have to go across different ______.