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搜题
【单选题】
小儿麻痹症的病原体是A.
脊髓灰质炎病毒
B.
乙脑病毒
C.
单纯疱疹病毒
D.
麻疹病毒
E.
EB病毒
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反馈参考答案：
举一反三
【简答题】______ is not only statistical but also interesting.
【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】The rising phase of the action potential is due to
A.
Na+ flow into the cell only.
B.
Na+ flow out of the cell only.
C.
K+ flow out of the cell only.
D.
K+ flow into the cell only.
E.
Na+ flow out of the cell and K+ flow into the cell.
【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】Due to action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.
A.
reciprocating
B.
rotating
C.
running
D.
removing
【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】What is the statistical reserve？（）
A.
Bandwidth that is reserved for SVCs to route over a trunk
B.
Bandwidth that is reserved on a trunk so that ABR connections can burst
C.
Bandwidth on a trunk that is reserved for control traffic and cannot be used by connections
D.
Bandwidth that cannot be allocated to connections but can be used to accommodate statistical variations in the traffic
【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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