单选题Each NCS woks as a type of（）, assisting controlling and monitoring telex and telephone network as quickly as possible.Aswitch operatorBcommunication gatewayCnational operatorDon-scene commande
单选题
Each NCS woks as a type of（）, assisting controlling and monitoring telex and telephone network as quickly as possible.
A
switch operator
B
communication gateway
C
national operator
D
on-scene commande
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