Given： What is the result of calling search with a valid List implementation？ （）

What is the primary purpose for Digital Selective Calling (DSC)?（）

The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.

____

Distress and safety communications following DSC calling will be performed by radiotelephony or（）.

Excuse me for calling you so ______ in the evening.

What did Mother Rigby want to show by calling Feathertop her “pet”?

Several users have recently been calling the helpdesk about a recent network outage. These calls have increased in the last hour and are all by different users calling about the same issue. Which of the following types of communication skills should the helpdesk technicians MOST likely exercise while answering each call? （）

“Calling once，calling twice，last calling”（翻译）（）。

Without calling JTAC, which two troubleshooting tools on a MAG Series device would you use to identify the cause of an authentication failure?（）