A:has left
B:was left
C:is leaving
D:has been left
在极坐标系中,曲线ρ=2cosθ是( )
从原始社会到现今,我国水稻种植区域扩大的主要因素是( )
—I since I was 11. Now I am thinking about picking it up again.
—Good for you!
已知函数fx是定义在R上的偶函数,fx+1为奇函数,f0=0,当x∈(0,1时,fx=log2x,则在8,10内满足方程f(x)+1=f(1)的实数为