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beneficial challenging energetic fascinating refreshingamusing popular relaxing satisfying peaceful5. It is very ________ to people developing some good hobbies and interests.

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beneficial challenging energetic fascinating refreshingamusing popular relaxing satisfying peaceful6. My hobby is listening to classical music. Music can be very ________ especially after people have worked for a whole day.

101位键盘的编码器输出位二进制代码。

A. 2
B. 6
C. 7
D. 8

一个BCD-7段译码器的输入为0100，则其有效的输出为。（华东师范大学）

A. a，c，f，g
B. b，c，f，g
C. b，c，e，f
D. b，d，e，g

编码器、译码器都应由触发器组成。

A. 对
B. 错