若x>y,则下列式子错误的是( ).
A:x-3>y-3 .
B:3-x>3-y .
C:x+3>y+2 .
D:x3>y3.
Experts said it was that Malaysia Airlines Flight 370(马航370) had changed course and turned back toward Kuala Lumpur(吉隆坡).
《西湖的绿》有哪些特点?( )
2.5-1.5+1.4×5.6÷0.8=____
观察法是科学探究的基本方法之一,以下属于观察法的是( )