—What's this?
—____________.
A:They are keys
B:Yes, it is
C:It's an ID card
D:This is a ring
在Rt△ABC中,∠C=90°,cosA=34,AB=8,则BC=( )
小浩同学用天平、量筒和水等器材测量小石块密度的实验中
——Could you please tell me ?——Sure. There's a flower store on the second floor.
观察函数y1和y2的图象,当x=0,两个函数值的大小为( )