题目内容

TETRA是一种_______________（信令/标准）

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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

This approach stems from a stongly held belief that voluntary action a major force for positive environmental change.

A. measures
B. changes
C. supports
D. represents