题目内容

What are the types of communication channels？

A. simplex
B. half duplex
C. complex
D. duplex

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For successful communication there must first be

A. message
B. sender
C. receiver
D. encode

Please connect the following communication channels accordingly.

Please connect the following description accordingly

The way the sender chooses to transmit or encode the message is called

A. message
B. encoding
C. medium