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【单选题】
熔断器的运行和维护时,以下更换熔体注意的事项中不正确的是A.
安装熔体必须保证接触良好,并经常检查
B.
更换熔体不一定要与原来的熔体规格相同;需将熔体管整体更换时,应用相同规格熔管备件
C.
熔体安装时,应注意不能使熔体受损伤,表面氧化的应更换。
D.
跌落式熔断器的熔丝不应过大,应根据变压器一次额定电流来配送,并使用合格的专用熔丝
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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
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