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【简答题】
在单片机的P1口上接有8只LED。在外部中断0输入引脚INTO(P3.2)接有一只按钮开关k1.要求将外部中断0设置为电平触发。程序启动时,P1口上的8只LED。每按一次按钮开关k1,使引脚INTO接地,产生一个低电平触发的外中断请求,在中断函数中,让低4位的LED与高4位的LED交替闪烁5次。然后从中断返回,控制8只LED再次。 (1)绘制电路原理图 (2)编写控制程序
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举一反三
【单选题】子宫颈癌直接蔓延途径中最为常见的是（）
A.
沿子宫下段肌壁间向上蔓延
B.
外生型沿阴道黏膜向下蔓延
C.
沿宫旁两侧向盆壁蔓延
D.
沿宫颈前方向膀胱蔓延
E.
沿宫颈后方向直肠蔓延
【单选题】关于水灭火系统、二氧化碳系统、干粉灭火系统、泡沫系统，下列说法错误的是：
A.
水灭火系统适用于任何船舶
B.
二氧化碳系统适用于货船凡是有可燃物的处所
C.
干粉灭火系统主要适用于液化气体船
D.
泡沫系统主要适用于大型油船的货油舱、机舱及货油舱甲板区域
【单选题】Which is not correct?
A.
In the old days, farmers keep them and decorate it with flowers.
B.
In the old days, farmers always make little dolls out of corn.
C.
In the old days, farmers always keep some of the last corn.
D.
In the old days, farmers always eat all the last corn.
【单选题】Ricci is compared to Columbus in the passage mainly because
A.
they both benefited from Italian sponsors.
B.
they were explorers in their own ways.
C.
they obtained overseas sponsorship.
D.
they got a warm reception in America.
【单选题】Which of the following is NOT true?
A.
Spielberg’s Firelight was quite a success as a beginner’s first try.
B.
Spielberg himself was terrified by the book Jaws.
C.
Raiders of the Lost Ark was a great hit after Jaws.
D.
The producer of Sugarland Express considered it a failure.
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