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【单选题】
科学家研究发现，从怀孕妇女胎盘的羊水中发现的干细胞，其品质与早期胚胎中的胚胎干细胞相当，在实验室培养后生成了多种人体器官细胞，如骨骼、血管、肌肉、神经以及肝脏等，以下有关说法不正确的是（）A.
从羊水中提取干细胞的最大优势是提取过程中不会对胎儿造成伤害
B.
这些骨骼、血管、肌肉、神经等的形成是细胞分裂与分化的结果
C.
早期胚胎中的胚胎干细胞分化形成骨骼、血管等的过程是不可逆的
D.
从羊水中提取的干细胞与由其生成的肌肉细胞的染色体组成有所差异
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【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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