下列不是我国钢铁工业基地的是( )
A:武汉
B:青岛
C:包头
D:攀枝花
(Ⅰ)求a和ω的值;
(Ⅱ)求函数f(x)在0,π上的单调递减区间.
— shirt is this? Is it Li Liang's?
—No, it's Tiantian's.