皮皮学，免费搜题
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【单选题】
下列哪种维生素具有抗氧化功能? ( )A.
维生素A
B.
维生素B2
C.
维生素C
D.
维生素D
E.
叶酸
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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】The rise in the action potential of nerve fibers is due to( )
A.
K+ enters the cell
B.
K+ moves from cell to extracellular
C.
Na+ enters the cell
D.
Na+ moves from cell to extracellular
【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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