题目内容

Which of the following is not renewable energy?

A. Wind energy
B. Fossil fuels
C. Solar energy
D. Geothermal energy

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What is meaning of “red herring”?

A. Something that distracts attention from the real issue
B. Something that attracts attention
C. A dead herring
D. A kind of fish living in the sea

51单片机的外部中断触发请求方式有______ 触发和______ 触发。

51单片机中,如果5个中断源设为同级别的中断,那么最先被响应处理的是______ 。

MCS-51单片机的4个并行I/O口中,当系统扩展外部存储器或I/O口时,______ 口用作低8位地址线和数据线,______ 口用作高8位地址线,P3口的相应引脚会输出控制信号。

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