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【单选题】
胸外心脏按压术的正确操作是（）A.
将病人仰卧于硬板床上，下肢抬高
B.
按压时左右手平行叠放，掌根置于胸骨上
C.
借双肘关节力量向下按压
D.
按压频率60～80次／分
E.
按压后缓慢放松使胸骨自然复位
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反馈参考答案：
举一反三
【单选题】The evil manners would be ______ root and branch due to the forceful action taken by the local government.
A.
exterminated
B.
exemplified
C.
facilitated
D.
emitted
【单选题】A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.
A.
is
B.
is to be
C.
will be
D.
being
【单选题】About the forming mechanism of action potential, ascending branch is due to ( )
A.
K+ excurrent flow
B.
K+ incurrent flow
C.
Na+ excurrent flow
D.
Na+ incurrent flow
【单选题】The one-way nature of action potential propagation down an axon is primarily due to
A.
sodium ion depletion
B.
potassium ion depletion
C.
the refractory period
D.
ATP loss
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