A:310
B:25
C:12
D:35
如图所示,平底茶壶的质量是400g,底面积是40cm2,内盛0.6kg的开水,放置在面积为1m2的水平桌面中央.试求:
(1)水对茶壶底部的压力;
(2)茶壶对桌面的压强.
赢得各民族拥戴,被北方各族尊为“天可汗”的是( )
— What would you send to your sister as the Christmas gift?
— I haven't decided yet. I ________ send her a handbag.
①∀x>0,不等式f(x)<2x恒成立;
②∃k∈R,使方程f(x)=k有四个不相等的实数根;
③函数f(x)的图象存在无数个对称中心;
④若数列{an}为等差数列,且f(al)+f(a2)+f(a3)=3π,则a2=π.
其中的正确命题有____.(写出所有正确命题的序号)