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【单选题】
关于共轭效应的描述,下列哪种说法是错误的 ( )
A.
共轭体系具有共平面性
B.
共轭体系内所含的和的长度趋于平均化
C.
共轭体系能量显著降低
D.
共轭效应的传递随着距离的增加而迅速减弱
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A.
may
B.
might
C.
will
D.
might have
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A.
去枕仰卧位,头偏向一侧
B.
抬高床头15°~20°
C.
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D.
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【单选题】患者王某,男,62岁,以呼吸困难、嘴唇发绀、烦躁不安而急诊入院,入院诊断为风湿性心脏病合并心力衰竭,为了缓解症状,患者应采用的体位是
A.
去枕仰卧位,头偏向一侧
B.
拍高床头15°~20°
C.
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D.
拍高床头70°~80°,膝下支架拍起15~20°
E.
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A.
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A.
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B.
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A.
must have killed
B.
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C.
should have killed
D.
might have killed
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