题目内容

党的十九大以来，我国社会主要矛盾的变化，改变了我们对我国社会主义所处历史阶段的判断。

A. 对
B. 错

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What are the types of communication channels？

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

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