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问题 单项选择题

双代号网络计划中的节点表示( )。

A．工作

B．工作的开始

C．工作的结束

D．工作的开始或结束

答案

参考答案：D

解析： 双代号网络图又称箭线式网络图，它是以箭线及其两端节点的编号表示工作；同时，节点表示工作的开始或结束以及工作之间的连接状态。

填空题
把单词或句子按要求分类。
bird, bear, balloon, ball, bread, brown, six, eight, doll, kite, duck, three, French fries, chicken,
cake, coffee, blue, Happy birthday to you, white, juice, tea, pink, Happy New Year, hand, foot,
Happy Teachers' day, arm, milk, eraser, ruler, four, sharpener, pen, ear, mouse
1. 动物: ________________  ________________  ________________  ________________
2. 数字: ________________  ________________  ________________  ________________
3. 玩具: ________________  ________________  ________________  ________________
4. 食物: ________________  ________________  ________________  ________________
5. 饮料: ________________  ________________  ________________  ________________
6. 颜色: ________________  ________________  ________________  ________________
7. 器官: ________________  ________________  ________________  ________________
8. 文具: ________________  ________________  ________________  ________________
9. 祝贺语: ______________________  ______________________  ______________________ 
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单项选择题

An analog signal’s characteristic quantity representing data may 66) . at any instant, any value within a continuous (67) . For example, an analog signal may follow continuously the values of another physical quantity representing data.

A discrete signal is composed of (68) elements in time, each element having one or more characteristic quantities which can represent data. Examples of characteristic quantities are amplitude, waveform, (69) , and position in time. A digital signal is a special case of discrete signals, in which data are represented by a (70) number of well-defined discrete values that one of its characteristic quantities may take in time.

（68）处填（）。

A．sequent

B．contiguous

C．following

D．successive
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