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【单选题】
听力原文： I live in a big old house. At night you can sometimes hear strange noises. Last Saturday I got home late. I went upstairs, washed and went to bed. My bedroom was very cold and it took me about an hour to get to Sleep Suddenly I awoke. The room was in darkness, and I could hear a sound which seemed to come from the window. I lay quite still and listened. Then I heard it again: 'Scratch, scratch...scratch.' It came from the waste paper basket. I turned on the light beside my bed and the noise stopped at once. I climbed out, trembling and went over to the waste paper basket. A piece of paper near the top moved ever so slightly. Then I saw a tiny gray face and two little eyes staring up into mine. It was a baby mouse. What should I do? He just sat there looking at me, as confused as I was. Carefully I picked up the basket, and carried it to the door. Then I opened the door and went back to bed. In the morning he went away. (30)A.
Upstairs.
B.
A rubbish container.
C.
Outside the window.
D.
Pieces of paper under the bed.
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【简答题】C51单片机外接晶振频率为12MHz,则其定时器工作在16位计数方式时,最长的中断间隔时间是( )ms。
【单选题】若已定义:int a=6;float b=1.5;要求输出形式为:6*1.50=9.00应选用的正确的输出语句是:( )
A.
Printf(“%d*%f =%f”,a,b,a*b);
B.
Printf(“%d*%.2f =%.2f”,a,b,a*b);
C.
Printf(“%d*%d =%.2f”,a,b,a*b);
D.
Printf(“%.2f*%.2f =%.2f”,a,b,a*b);
【简答题】使用八选一的的数据选择器 74LS151 来实现下列函数: Y=AB+AC+BC
【单选题】若已定义:int a=6;float b=1.5; 要求输出形式为: 6 * 1.50=9.00 ,应选用的正确输出语句是( )。
A.
printf("%d * %f=%f",a,b,a*b)
B.
printf("%d * %.2f=%.2f",a,b,a*b)
C.
printf("%d * %d=%.2f",a,b,a*b);
D.
printf("%.2f * %.2f=%.2f",a,b,a*b)
【简答题】用八选一的数据选择器 74LS151 实现逻辑函数 。
【单选题】若已定义:int a=7,b=6;float m=1; 则正确的表达式是( )。
A.
(a+b)*=m
B.
a=(b!=5)
C.
m=float(a)/b
D.
(a+b)++
【多选题】“流动镶嵌模型”的主要内容( )
A.
所有的 生物膜都是双层膜。
B.
蛋白质分子镶嵌、贯穿或覆盖在磷脂双分子上。
C.
磷脂双分子层是生物膜的基本支架。
D.
磷脂分子和大部分蛋白质分子是可以运动的，这使膜具有一定的流动性。
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