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    Michelle, a famous lady, has found that more than 25％ students are too fat in her country. It is a very serious problem. So she starts a health program to deal with it. The health program is to reduce the amount of fat students today and in the future.

    The program will get families, schools, newspapers, magazines and TVs to join together and deal with the students' obesity. So that students will be at a healthier weight. The program includes: Food stores should sell healthier foods. Schools should serve healthier meals with less fat and should also offer gym classes.

The lady is trying to fight the students' obesity all over the country because it can cause illnesses and higher health cost. She wants the students to eat right, exercise more and control their weight. At the same time she has also set a good example by planting a vegetable garden. She hopes that the garden will encourage more people to plant one too.

     The health program is really helpful to the students today and in the future. As she says, we cannot always build the future for youth, but we can build our youth for the future.

请结合下面的资料，分析回答问题：

CCTV《东方时空》2007年1月19日曾播出节目《一起输血背后的故事》

以下是节目的基本内容：

2006年12月3日，河南省泌阳县老河乡卫生院，在为剖腹产生孩子的寇娜输血时，把她的O型血检测成了B型血，并为她输入了400ml的B型血．

病人体内输入了与自身血型不符的异型血之后，出现了严重的溶血性反应，造成了产妇寇娜肝肾功能衰竭、生命垂危的恶果．经过连续18天的抢救治疗，寇娜的生命体征开始逐渐稳定．这个年仅23岁的年轻生命，终于从死亡线上的挣扎了过来．​

导体的电阻可能与：①导体的长度有关，②导体的横截面积有关，③导体的材料有关。实验室提供了4根电阻丝，其规格、材料如下表所示.