—So it is. It is ________ to hold more than one thousand people.
A:big enough
B:enough big
C:too big
D:big too
对于函数f(x)=sinπx,x∈0.212fx-2,x∈2,+∞,有下列4个命题:
①任取x1、x2∈0,+∞),都有|f(x1)﹣f(x2)|≤2恒成立;
②f(x)=2kf(x+2k)(k∈N*),对于一切x∈0,+∞)恒成立;
③函数y=f(x)﹣ln(x﹣1)有3个零点;
④对任意x>0,不等式f(x)≤kx恒成立,则实数k的取值范围是98,+∞).
则其中所有真命题的序号是____
在△ABC中,a=2,b=3,c=600,则S△ABC=( )