A:turned up
B:turned off
C:turned on
D:turned down
This is public place for us to do some reading. Don't talk or laugh loudly in public.
下列关于细菌的叙述正确的是( )
在长方形ABCD中,AB=2,BC=1,动点P从点B出发,沿路线B→C→D做匀速运动,那么△ABP的面积S与点P运动的路程x之间的函数图象大致为( )