A:(1,2)∪(3,+∞)
B:(10,+∞)
C:(1,2)∪(10,+∞)
D:(1,2)
3.2÷0.8=
7.2÷0.9=
3.2+5.8﹣0.7=
0×1.25×8=
910÷70=
36×25%=
0.5×0.5÷0.5=
1.03﹣0.44=
— Are there any flowers _______ the tree.— No. But there are many birds _________ it.
用足量的CO还原4.0g某种铁的氧化物,生成的气体全部被足量的澄清石灰水吸收,得到沉淀7.5g,则这种铁的氧化物可能是( )