问题
单项选择题 A1/A2型题
下列符合房性早搏心电图表现的是（）
A.P’波提前出现，与窦性P波不同
B.代偿间期完全
C.QRS>0.12s
D.提前出现的QRS波群无提前出现的P’波
E.P’-R间期<0.12s
答案
参考答案：A
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下列符合房性早搏心电图表现的是（）
A.P’波提前出现，与窦性P波不同
B.代偿间期完全
C.QRS>0.12s
D.提前出现的QRS波群无提前出现的P’波
E.P’-R间期<0.12s
参考答案：A
| 用下面方框中所给短语的适当形式填空。 | |
2. The farmer grows vanous kinds of crops, ______ wheat, com, cotton and rice. 3. We don't know why his performance didn't ______ to his usual standard. 4. You should pay more attention to your study ______ because you are a student. 5. They had to stay at home instead of going shopping ______ a heavy rain. |