题干

类比三角形中的性质:
(1)两边之和大于第三边;
(2)中位线长等于底边的一半;
(3)三内角平分线交于一点;
可得四面体的对应性质:
(1)任意三个面的面积之和大于第四个面的面积;
(2)过四面体的交于同一顶点的三条棱的中点的平面面积等于第四个面面积的
1
4
(3)四面体的六个二面角的平分面交于一点.
其中类比推理结论正确的有(  )

A:(1)

B:(1)(2)

C:(1)(2)(3)

D:都不对

上一题 下一题 0.0难度 选择题 更新时间:2019-05-23 11:45:18

答案(点此获取答案解析)

C

同类题4

信息归纳: 请阅读下面这篇文章,根据所提供的信息,完成信息卡。

    One day, Howard Kelly, a poor boy who was selling goods from door to door in order to pay his way through school, found he had only one coin left, and he was hungry.

    He decided he would ask for a meal at the next house. However, he became very nervous when a lovely young woman opened the door. Instead of a meal he asked for a drink of water.

    Young woman thought he looked hungry so she brought him a large glass of milk. He drank it slowly, and then asked, “How much do I owe(欠) you?”

     “You don't owe me anything,” she replied, “We never accept payment for a kindness.” He said, “Then I thank you from my heart.”

    Years later that young woman became very ill and was finally sent to the big city, where they called in specialists (专家)to study her rare disease. Dr. Howard Kelly was called in for the consultation (咨询). When he heard the name of the town she came from, he went to her room. He recognized her at once. He decided to do his best to save her life.

    After a long struggle, the battle was won. The woman thought it would take the rest of her life to pay for the final bill. But when she saw the bill, she read these words: “Paid in full with one glass of milk” (Signed by Dr. Howard Kelly).

Information Card

The reason why the poor boy was selling goods

____

Howard Kelly's feeling when a lovely lady opened the door

____

The thing that the young woman brought him

____

The specialist who saved the woman

____

The final bill

____