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【单选题】
心动过速心电图特征正确的是( )A.
性心律的频率≥100次/分
B.
1岁以下儿童的心率>120次/分
C.
P波Ⅱ、Ⅲ、avF直立,avR倒置
D.
心房波为连续的规则的大锯齿波
E.
P-R时限相应缩短,Q-T时限相应延长
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【简答题】Unfamiliar threats are ______.
【简答题】We now turn our attention to these topics and how to _________ the threats.
【单选题】_____, the players began the game.
A.
Having taken our seats
B.
Our taking seats
C.
We having taken the seats
D.
Us having taken the seats
【简答题】What kind of threats our body is confronted with?
【单选题】In our school, English and mathematics are compulsory while Western literature and second language are()
A.
operational
B.
optional
C.
instructive
D.
functional
【单选题】In the passage, “All of these threats around the corner” means __________.
A.
all of these threats are just our imagination
B.
all of these threats have occurred already
C.
all of these threats will appear on the street corner
D.
all of these threats are likely to happen very soon
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