某地的一座人行天桥如图所示，天桥高为6米，坡面BC的坡度为1：1，为了方便行人推车过天桥，有关部门决定降低坡度，使新坡面的坡度为1： $\sqrt{3}$ ．

公有制经济和非公有制经济在我国经济中的地位不同，公有制经济(    )

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    Do you want to join our sports clubs? Please call Mr White. He plays basketball very well. His telephone number is 481-1324. Or you can call Miss Jones at 481-1327. She is our tennis coach. She is good with the students.