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【单选题】
患者女性,66岁,一个月来胸闷伴头晕,有一过性黑蒙现象近一晕厥3次,行心电图检查:P波频率为73次/分,R波频率为38次/分,且宽大畸型,时间为0.16秒,P与QRS波无关,最可能的诊断:A.
Ⅰ度房室传导阻滞
B.
Ⅱ度Ⅰ型传导阻滞
C.
Ⅱ度Ⅱ型传导导阻滞
D.
Ⅲ度传导阻滞
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【单选题】Some scientists believe that hibernation is started by______.
A.
a lack of food
B.
calcium deposits
C.
a body chemical
D.
a lack of water
【单选题】Last month, American scientists started working on _____ project aimed at improving _______ ability to predict earthquake.
A.
the; a
B.
a; an
C.
the; an
D.
a; the
【简答题】Scientists resist talking about their options because they don't want people to
【单选题】After collecting the last Martian dust particle，the scientists have started to build up a portrail gallery of it．
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】Scientists started to______the Anartica in the 19th century.
A.
explode
B.
explore
C.
expose
D.
expand
【单选题】Scientists don’t think that a warm winter always has a negative influence on our life,____?
A.
don’t they
B.
do they
C.
hasn’t it
D.
has it
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