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【单选题】
符合左心房肥大的心电图改变是（）。A.
P波时限<0.12s
B.
Ptf V1 绝对值为0.02mm.s
C.
P Ⅱ 、Ⅲ、aVF振幅≥0.25mV
D.
Ⅱ、Ⅲ、aVF导联P波时限≥0.12s，P波双峰，峰间距≥0.04s
E.
P波形态
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举一反三
【单选题】What does the man mean when he says this:
A.
He wants to change the topic of the talk.
B.
He wants the professor to elaborate on a point in the lecture.
C.
He is trying to remember something the professor already said.
D.
He wants to correct some mistakes that the professor made.
【单选题】听力原文：W: There is a man in the reception area. He says he has an interview with Louis at 11:30. M: Oh, Louis must have forgotten about that. His parents came to visit him from Boston and he's probably ...
A.
In a meeting room
B.
At the office
C.
In Boston
D.
In New York
【简答题】当外界存在一个很强的干扰信号,由于收信机的非线性仍能造成对有用信号增益的降低(受到抑制)或噪声提高,使接收机灵敏度下降,这种干扰称为( )干扰. A. 同频道 B. 邻道 C. 杂散辐射 D. 阻塞
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