若圆锥的全面积为底面积的3倍,则该圆锥母线与底面所成角大小为____
下列有关我国气候特征的叙述,正确的有( )
With _____ help of my teacher, I have made great progress.
China has a large population, people can everywhere.
在同一直角坐标系中画出下列一次函数的图象
(1)y=3x
(2)y=5x
(3)y=﹣5x
(4)y=﹣3x.