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歡迎您訪問數學考題練習:下列語句正確.!

數學考題練習:下列語句正確.

更新時間:2024-01-12 16:27:14作者:貝語網校

下列語句正確.

A.射線比直線短一半

B.延長AB到C

C.兩點間的線叫做線段

D.經過三點A,B,C不一定能畫出直線來

試題答案

D

試題解析

根據直線、射線、線段有關知識,對每個選項注意判斷得出正確選項.

解答:A、直線和射線都沒有長短,所以射線比直線短一半錯誤,故本選項錯誤;

B、延長AB到C,正確的說法是延長線段AB到C,故本選項錯誤;

C、兩點間的線叫做線段,不符合線段的定義,故本選項錯誤;

D、若三點A,B,C在一條直線上,則經過三點A,B,C能畫出直線來;若三點A,B,C不在一條直線上,則經過三點A,B,C不能畫出直線來.所以說經過三點A,B,C不一定能畫出直線來,故

本選項正確.

故選:D.

點評:此題考查的知識點是作圖--尺規作圖的定義,熟練掌握概念是解題的關鍵.

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