【单选题】男,45岁。反复胸闷、心悸、端坐呼吸、胸腔积液半年。查体:呼吸短促,两肺广泛细湿啰音,心浊音界扩大,心率100次/分,呈舒张期奔马律,偶发期前收缩。X线胸片示心胸比率0.65,两肺水肿。心电图示完全性左束支传导阻滞,偶见室性期前收缩。超声心动图提示左心室明显增大,舒张末期内径70mm,左室整体运动减弱,射血分数(EF)为24%,缩短分数(FS)为12%。最可能的诊断是()
【单选题】下列有关氧化还原反应的叙述 中,正确的是
【判断题】一般计算渠道输水损失都是考虑渠道的漏水损失,其余部分由于量少而忽略不计。
【单选题】男性,45岁。反复胸闷、心悸、端坐呼吸、胸腔稠液半年。查体:呼吸短促,两肺广泛细湿啰音,心浊音界扩大,心率100次/分,呈舒张期奔马律,偶发前期收缩。X线胸片示心胸比率0.65,两肺水肿。心电图示完全f生左束支传导阻滞,偶见室性期前收缩。超声心动图提示左心室明显增大,舒张末期内径70mm,左室整体运动减弱,射血分数(EF)为24%,缩短分数(FS)为12%。最可能的诊断是()
【单选题】Why does the professor clarify the concept of a 'fairy'?
A.
To explain the origins of the term 'fairy tale'
B.
To eliminate a possible definition of the term 'fairy tale'
C.
To support a claim about the function of fairy tales
D.
To indicate that fairies are a major element in fairy tales
【单选题】椭圆 x 2 a 2 + y 2 b 2 =1 (a>b>0) 顶点A(a,0),B(0,b),若右焦点F到直线AB的距离等于 1 2 |AF| ,则椭圆的离心率e=( )
【简答题】A.In the front of the white pages. B.Right after the white pages. C.At the end of the telephone book. D.On the first page of the telephone book.
【单选题】According to the article, which of the sentence can best describe the definition of the telecommunication?
A.
Telecommunications are devices and systems that transmit electronic signals across long distances.
B.
Telecommunications allows people around the world to contact one another, to access information instantly, and to communicate from remote areas.
C.
Telecommunications usually involves a sender of information and one or more recipients(收件人) linked by a technology.
D.
Telecommunications are devices and systems that carry, electronic signals across short distances.