- Do the Chinese like playing basketball?
- .
如图,小正方形的边长均为1,扇形OAB是某圆锥的侧面展开图,则这个圆锥的底面周长为( )
— I _____ thirsty, Mum.
1度电可供一家用电器正常工作25h,这盏灯的额定电压和额定功率分别是____ 和____ .