A:3
B:4
C:154
D:574
The doctor advised her to eat more bean products________meat which might be harmful to her heart.
在下列四个函数中,满足性质:“对于区间(1,2)上的任意x1,x2(x1≠x2).f(x1)-f(x2)<x1-x2恒成立”的只有( )
按要求写句子。
用“尽快”写一句话。