函数y=log2(x2-6x+17)的值域是( )
[3,+∞)
Her idea seems very_____ , so we don't understancl it.[ ]
A. conventional
B. abstract
C. evident
D. superb
下列能够促进胆固醇代谢的水溶性维生素是
A.维生素B1
B.维生素B2
C.维生素C
D.维生素B12
E.叶酸