代表两心房去极化过程的是（）
A．心电图的P波
B．心电图的QRS波群
C．心电图的ST段
D．心电图的Ta波
E．心电图的T波
参考答案：A
-Some Chinese students find it hard to adapt to the life when in London.
-Exactly, ________ they've learnt a lot about the city before.[ ]
A．if only
B．now that
C．as though
D．even though
电子仪器泛指哪些？
