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问题
单项选择题
QRS波群方向交替变换的室速称（）
A.单形性室速
B.双向性室速
C.阵发性室速
D.心室夺获
E.室性融合波
答案
参考答案：
B
选择题
看图选择。
( ) 1. He has a car. He __________ to work.
A. walks
( ) 2. She goes to work by __________.
B. drives
( ) 3. She works in a school. She goes to work by __________.
C. bicycle
( ) 4. He is a clerk. He __________ to work.
D. bus
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名词解释
闭（环）系统
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