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问题 单项选择题

某计数器最大输入脉冲数为15，则组成该计数器所需最少的触发器个数为______。

A．5
B．4
C．3
D．2

答案

参考答案：B

解析：计数器最大脉冲数为15，用二进制数表示需要4位，需要4个触发器，故选项B正确。

填空题

单词拼写

1.We saw a_____________ farms which were built more than a hundred years ago.

2.The beautiful scenery in that faraway mountain village is beyond d___________.

3.Are Information Technology and PE a_______________ subjects at your school?

4.I didn't follow the i______________ printed on the box, and broke the machine.

5.Li Hong's f__________ in English and French impressed the audience present.

6.That is a _____________(有历史意义的) battle.

7.I remember my first day at _____________(幼儿园)very clearly.

8.Tom's been __________(表现)rather oddly.

9.His abilities were not _____________(赏识) in his job.

10.I love reading good _____________(文学).

11. 对某事热心的   be e__________.

12. 在某时间以前  p_________.

13. 报道奥运会               

14. 对……采取了积极的态度             

15. 被允许进入……(录取)              

16. 挥动手臂                   

17. 写一个关于……的摘要                   

18. 由……来决定                 

19. 在某方面有问题                     

20. 在渡假                  
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单项选择题

以下属于水溶性软膏基质的是

A．十八醇
B．硅酮
C．硬脂酸
D．聚乙二醇
E．甘油
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