教学法中的warm up和lead in有啥区别

Posted 2023-05-05

教学法中warm up和lead in的区别为：意思不同、用法不同、侧重点不同。

一、意思不同

1.warm up意思：（机器或引擎）预热，（使）启动;（使）活跃起来，（使）兴奋起来，暖场。

2.lead in意思：引导入内，导入

二、用法不同

1.warm up用法：warm up是属于热身环节。是一个刚入门的老师备课环节。目的就是要讲完课后对要对你当堂课所讲知识进行再一次重复，让学生了解这堂课的主要知识点。

2.lead in用法：lead in导入，好的导入是好的课程一半，导入方式可以很多种，要新颖，有趣，点题、热身环境是属于本课知识点的初级了解阶段。

三、侧重点不同

1.warm up侧重点：侧重于将对象引入到教学环境中，类似开场白，开场语。

2.lead in侧重点：侧重于将注意力引入到讲解的内容中，并且做铺垫。

参考技术A warm up的主要作用是将对象引入到教学环境中，类似开场白。lead in是要将注意力引入到讲解的内容中，并且做铺垫。 参考技术B warm up和lead in可以认为是先后紧紧连在一起的两个环节，前者为后者做铺垫。好的warm up为成功lead in奠定基础。有时不注意的话就有可能看成是一个环节。本回答被提问者采纳

HDU4612 Warm up

Time Limit: 5000MS

Memory Limit: 65535KB

64bit IO Format: %I64d & %I64u

Description

　　N planets are connected by M bidirectional channels that allow instant transportation. It‘s always possible to travel between any two planets through these channels. 
　　If we can isolate some planets from others by breaking only one channel , the channel is called a bridge of the transportation system. 
People don‘t like to be isolated. So they ask what‘s the minimal number of bridges they can have if they decide to build a new channel. 
　　Note that there could be more than one channel between two planets. 

Input

　　The input contains multiple cases. 
　　Each case starts with two positive integers N and M , indicating the number of planets and the number of channels. 
　　(2<=N<=200000, 1<=M<=1000000) 
　　Next M lines each contains two positive integers A and B, indicating a channel between planet A and B in the system. Planets are numbered by 1..N. 
　　A line with two integers ‘0‘ terminates the input.

Output

　　For each case, output the minimal number of bridges after building a new channel in a line.

Sample Input

4 4
1 2
1 3
1 4
2 3
0 0 

Sample Output

0

Source

2013 Multi-University Training Contest 2

 

在原图上任意加一条边，询问最少还剩下多少桥。

缩完点，找树直径，把直径两端连起来，就是最优策略。