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  • 學做指南針作文400字

      指南針是我國四大發現之一,是我們中國人的驕傲。指南針的感化可大了,正在野外郊逛的人,能夠用指南針來分辨標的目的,正在大海上帆海的海軍,能夠用指南針來確認方位。正在今天的做文課上,馬教員就帶同窗們做了一個指南針。

      馬教員先拿了一根針和一塊磁鐵,再把針正在磁鐵上磨,留意要往一個標的目的磨,一曲磨到針能吸住鐵的時候,馬教員怕磁力不敷,于是把針的另一頭也磨了磨。磨好后,教員把它放正在黑板上,看能不克不及吸得住,成果實的吸住了,然后教員把針穿正在一張圓形紙片上,為了讓它能浮正在水面上,接著教員接了一杯水,預備驗證針能否能正在水上分辨標的目的,同窗們不約而同地跑上去看指南針有沒有做成功,馬教員問同窗們哪邊是北,哪邊是南。同窗們眾說紛紜,最初馬教員居心把針往東向放,只見不成思議的工作發生了,針慢慢地往南北標的目的轉,并且越來越快,終究,針指向了南和北,同窗們見了喝彩雀躍。

      這個嘗試成功了,我從中大白了,凡事都要多動腦筋。

    未經允許不得轉載:小學生作文網 » 學做指南針作文400字

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