题目内容

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。

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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
B. on
C. under
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

Capsules _______ up to 50 kg of goods could travel at 1500kph.

A. carry
B. carried
C. carrying
D. carries