题目内容

TETRA的中文全称是__________________。

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TETRA是一种_______________（信令/标准）

P32-3.2.6

Communications is the process of transmitting a message from a(n) to an audience via a channel.

A. root
B. resource
C. origin
D. source

Given that the patient smokes 50 cigarette a day, it would be to assume there is some hung damage.

A. inexpensive
B. costly
C. reasonable
D. dear