题目内容

8051单片机ALE引脚是( )引脚。

A. 地址锁存使能输出端
B. 外部程序存储器地址允许输入端
C. 串行通信口输出端
D. 复位信号输入端

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下列哪个引脚可以作为中断请求输入线( )。

A. P3.0
B. P3.2
C. P3.5
D. P3.4

RST(9)引脚必须加两个机器周期以上的高电平才有效。

A. 对
B. 错

migratedeadlydumpmake upleak1. Cancer is a __________ disease.2. In some developing countries, more and more people ___________to urban area.3. Sealed containers of nuclear waste have been____________ in the sea.4. The details were supposed to be secret but somehow____________out.5. North Africans __________ the largest immigrant(移民)group in the country.

1. She is a good actress, but still needs time to __________ (growth) into the part she is playing.2. Every day the chimneys of factories pour a large volume of smoke to the air to__________ (pollution) it.3. Oil and water do not _________ (mixture).4. Parents worry about the _________ (effect) of music on their children's behavior.5. In the jungle, they were driven to extremes in order to__________ (survival).

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