题干

用小立方体搭成一个几何体,使它的正视图和俯视图如图所示,搭建这样的几何体,最多要几个小立方体?最少要几个小立方体?

上一题 下一题 0.0难度 选择题 更新时间:2018-04-29 12:03:50

答案(点此获取答案解析)

解:由于正视图中每列的层数即是俯视图中该列的最大数字,因此,用的立方块数最多的情况是每个方框都用该列的最大数字,即如图①所示,此种情况共用小立方块17块,即最多要17块.

同类题1

阅读理解

    Dragons are not real animals, but look like a combination (组合体) of many animals such as snakes, fish and deer. They have two horns (角) and a long moustache (胡子). With fantastic powers, they fly in the sky or swim in the sea. They can make rain, too. The Chinese dragon is a symbol of strength and goodluck. The emperors of ancient China loved dragons. Their clothes were covered with pictures of dragons.

    We are proud to call ourselves the “descendants (传人) of the dragon”. In Chinese, “excellent”people are often called “dragons”. A number of Chinese sayings and idioms talk about dragons, for example, “Hoping one's child will become a dragon,” which means hoping he or she will be successful.

    It is said that people born in the Year of the Dragon have certain characteristics. They are creative, confident, brave and quick-tempered. There are some famous “dragons”who have done excellent things, for example, Deng Xiaoping, the famous businessman Li Jiacheng and the movie star Zhao Wei. They are all very successful.

    There are also some traditional festivals about dragons in China, such as Dragon Head – Raising Day and Dragon Boat Festival. We have different kinds of activities to celebrate them. These two festivals come every year, but the Year of the Dragon comes every twelve years. It was the year of the Dragon in 1976.

    The dragon is very important in Chinese culture. As the“descendants of the dragon”, it is necessary for us to know the views on dragons in our culture. It can help us understand why our parents always want us to be“dragons”.

根据短文内容,选择最佳答案。