题目内容

8086/8088 CPU的外部总线均采用传送方式。即在一个总线周期内,首先利用总线传送,然后再利用同一总线传送。

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80X86支持两种类型的中断:及,对应的两个中断请求引脚信号及。

I/O端口的编址方式有两种,分别为:和。

The system is based _______ a network of metal pipes.

A. in
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D. above

Air pumps are involved, but their role is limited _______ reducing resistance _______ the capsules' movement in the pipes.

A. to...to...
B. for...for
C. with...with
D. with...for

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