A:△Ek1=△Ek2
B:△Ek1<△Ek2
C:x2=3x1
D:x2<3x1
定义x为不超过x的最大整数,如3.6=3,0.6=0,﹣3.6=﹣4.对于任意实数x,下列式子中错误的是( )
— How much are the two pairs of trousers?— They are not expensive. I think one hundred dollars ______ enough.
下图为“两极地区图”,下列叙述正确的是( )