Each NCS woks as a type of（）, assisting controlling and monitoring telex and telephone network as quickly as possible.<br>A:switch operator<br>B:communication gateway<br>C:national operator<br>D:on-scene commande

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

出自：海船船员证

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