Your means the ability to remember events and experiences.
A:order
B:skill
C:memory
若函数f(x)=(x2﹣x﹣2)(x2+ax+b)的图象关于直线x=1对称,则f(x)的最小值是____
读图所示的两种地貌,回答下题.
用2000t含氧化铁80%的赤铁矿石,理论上可以炼铁____吨?