I don't remember the book yesterday.
A:where I put
B:where did I put
C:where will I put
D:where I will put
若a>b,则下列各式中一定成立的是( )
①a+2>b+2;②ac<bc;③﹣2a>﹣2b;④3﹣a<3﹣b.
人体的各种生理活动离不开营养物质,下列有关营养物质的叙述不正确的是( )
如图是眼球结构及成像示意图.下列有关叙述正确的是( )