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单选题

Refer to the exhibit. Which option correctly describes the order of signaling and call processing events when a branch employee calls headquarters?()

发布日期:2021-10-29

Refer to the exhibit. Which option correctly descr...
A

P,S,T,U

B

U,T,S,P

C

S,U,P,T

D

P,U,S,T

E

S,P,U,T

F

S,P,T,U

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