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实际进度前锋线如何绘制？

答案

参考答案：

前锋线比较法是通过绘制某检查时刻工程项目实际进度前锋线，进行工程实际进度与计划进度比较的方法，它主要适用于时标网络计划。所谓前锋线，是指在原时标网络计划上，从检查时刻的时标点出发，用点划线依次将各项工作实际进展位置点连接而成的折线。前锋线比较法就是通过实际进度前锋线与原进度计划中各工作箭线交点的位置来判断工作实际进度与计划进度的偏差，进而判定该偏差对后续工作及总工期影响程度的一种方法。

填空题

下图是用JavaScript编写的电子公告栏程序的执行效果，实现了预设消息的循环逐条发布。程序采用逐字延时的方式显示每条消息，模拟了类似打字机的效果。


[HTML文本]
＜html＞
＜body＞
＜title＞电子公告栏＜/title＞
＜script language=”JavaScript”＞
var i = 0; // 表示从当前消息中提取的字符个数
var TextNumber = -1;// 当前所显示的消息的序号(取值范围0-7)
var TextInput = new Object(); // 存放消息的数组
TextInput[0] = “中科院发表全基因纠测序论文”;
TextInput[1] = “未来两天中东部地区各有降水，局部地区大幅降温”;
TextInput[2] = “俄一直升机执行任务时坠毁，机上12人可能全遇难”;
TextInput[3] = “美国宇航局：哥伦比亚号解体在返航时已经注定”;
TextInput[4] = “统计显示Google取代雅虎成为最大搜索服务网站”;
TextInput[5] = “挑战极限自然条件，联想昭阳勇攀珠峰！”;
TextInput[6] = “第一攻击手刘昌赫再试牛刀，力压李世右”;
TextInput[7] = “姚明击败奥尼尔大威，美刊非白人体育人士列第一”;
TotalTextInput = 8;
var HotText = “ ”; // 当前要显示的公告消息
var Text = “ “;// 目前已经滚动显示出的文字
var Speed = 50; // 显示速度
var TimerId;// 定时器标识
var TimerOn = false;// 定时标记
function nextMessage()// 显示下一条消息
if (!TimerOn)

TimerOn = true;
clearTimeout (TimerId);
TextNumber =　　(1) 　; // 计算下一条消息在数组中的存放位置
document.forms[0].elements[1].value = TextNumber +1;
HotText =　　　(2)　　　; // 当前待显示的消息
teletype();

function teletype()
if (TimerOn)

TimerId =　　　(3)　　　;// 将消息写在消息框中
document.forms[0].elements[0].value =　　　(4)　　　;

function rollMessage() // 从待显示的消息中提取前i 个字符返回给teletype()显示
i++;
var CheckSpace = HotText.substring(i-1,i);
CheckSpace = ““ + CheckSpace;
if (CheckSpace == “ “) i++;
if (i ＞= HotText.length + 1)

TimerOn = false;
Text = HotText.substring(0,i);
i = 0;
return (Text);

Text = HotText.substring(0,i);
return (Text);
＜/script＞
＜/head＞
＜body＞
＜form＞
＜p align=”center”＞电子公告栏＜/p＞
＜table＞
＜-- 中间省略网页结构性文档 --＞
＜input TYPE=”text” value=”共8条” SIZE=”5” name=”1”＞
＜input TYPE=”button” VALUE=”下一条” onClick=”　　　(5)　　　”＞
＜/table＞
＜/form＞
＜/body＞
＜/html＞
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阅读理解
     Learning science in the classroom by reading textbooks can be really difficult and boring.     1      
You can learn science with games and experiments. 
     Play a game with friends to see whose balloon(气球)will stick to the wall for the longest period of time
before falling to the floor.    2     This static electricity is generated by rubbing a balloon against your
clothing. It becomes a lot of fun when you are competing against several other people to see whose
balloon sticks the longest.
          3   Closing your eyes and try to see if you can recognize juices, fruits and vegetables. This
experiment becomes a real challenge when you are competing against others to see if you can do better
than them.
      Parents and teachers are always looking for ways to keep children away from the TV set.    4    
And children will learn a scientific fact in each game.
A teacher said, " I wish all of my students would participate in these contests with their friends. They
really enjoy the challenge and they all seem to learn so much quickly and easily. " A parent said," I can
feel the excitement every time they play these games.      5        ."

A. But it doesn't have to be that way.
B. However, it's more import to keep safe.
C. You can learn about your sense of touch, taste and smell.
D. Through this you can learn the science of static electricity(静电).
E. Therse're a lot more ways for students to learn about science.
F. They are happy and at the same time they learn a lot about science.
G. These experiments and challenges are much more fun than anything on TV.
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