ADC0809与8031的中断方式接口电路中,转换结束后是由ADC0809的哪个引脚向8031发出一个脉冲提出中断请求。()
A.1IN
B.EOC
C.OE
D.ALE
参考答案:B
228. Now more and more people prefer to have a ______ at home --- a little dog, a cat or some other animals.
A.habit
B.hobby
C.parrot
D.Pet
下列各项中,属于自然资源的是( )
①天然宝石 ②皮革 ③羊毛衫 ④东北虎 ⑤煤油 ⑥水泥 ⑦农村沼气 ⑧阳光.
A.①⑤⑧
B.①④⑤⑧
C.①④⑧
D.④⑤⑧