锯子是木工的师祖鲁班发明的.
注意区分“发明”和“发现”的意思.
“发明”是指制造出一种从前不存在的东西,而“发现”则是指找出原本已经存在的东西.
猜你喜欢
- 1three years___ a long time for us students.A are B be C is D have been
- 2我不想玩了,太累了!用英语怎么说
- 3在托盘天平两盘上各放上一只烧杯,两烧杯中盛有等质量分数的足量盐酸,使两边保持平衡,此时向左边烧杯中加入11.2gCu,若要使两边再次保持平衡,需向右边烧杯中加入CaO( ) A.11.2g
- 4若数列{an]满足前n项和Sn=2an-4,bn+1=an+2bn,且b1=2,
- 5A great deal of smoke with c__ is sent into the air,causing much pollution
- 6已知F1、F2是双曲线x^2/a^2-y^2/b^2=1(a>0,b>0)的两焦点,以线段F1F2为边作正三角形,
- 7假设A属于B,B有5个元素,A的集合个数为什么有2的5次方个
- 89除一个数,商是4,余数是3,这个数是几?求算式`谢谢
- 9As is known to us,China is a country belonging to the Third World.句中belong是ing,前面为什么没Be动
- 10如果有理数a、b满足|ab-2|+|1-b|=0,试求1/ab+1/(a+1)(a+1)+1/(a+2)(a +2)+...+1/(a+2004)(b+2004)的