=30÷20
=1.5(吨).
答:实际每天烧煤1.5吨
___________I am in trouble, my classmates will help me out.
用简便方法计算.
1.01×101-1.01=____
There is an interesting place ____ (call) the Great Wall in China.
洋葱表皮细胞与人的口腔上皮细胞的区别是后者没有的是( )