—________. The beaches there are very beautiful and we also enjoyed some fresh seafood.
A:Not badly
B:Very much
C:Very good
D:So well
在Rt△ABC中,∠C=90°,Rt△ABC绕点A顺时针旋转到Rt△ADE的位置,点E在斜边AB上,连结BD,过点D作DF⊥AC于点F.
Her mother went to the market and____(buy)some vegetables.
食醋是厨房中的一种调味品,其中含有少量醋酸 。下列有关醋酸的说法不正确的是()
(I)若函数f(x)的最大值为2,求m的值;
(Ⅱ)若 x>1时,f(x)<k(1−3x)+xf'(x)+m−2(k≤2) 恒成立,求实数k的取值范围;
(Ⅲ)证明:x1x2<1.