A:absolutely
B:relatively
C:generally
D:basically
因式分解:
(1)3a2﹣27
(2)a3﹣2a2+a
(3)(x2+y2)2﹣4x2y2
(4)a2(x﹣y)+16(y﹣x)
下列不属于九大商品粮基地的是( )