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什么叫中断？设置中断有什么优点？

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已知FOSC＝6MHZ，试编写程序，使P1.7输出高电平宽40us，低电平宽360us的连续矩形脉冲。

单选Which of the following means nose inflammation?( )

A. laryngitis
B. bronchitis
C. rhinitis
D. gastritis

单选Which of the following means paralysis of the voice box?( )

A. laryngitis
B. laryngoplegia
C. laryngoplasty
D. laryngospasm

单选 Which of the following means insufficient oxygen in the blood?( )

A. hypoxemia
B. anoxia
C. hypoxia
D. hyperoxia