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建筑工地上有一个圆锥形沙堆,沙堆底面半径为2米,高1.5米.如果每立方米黄沙重1.7吨,这堆黄沙重多少吨?
The public transports system in many cities in the world()by the local authority.
A.is still ran
B.are still run
C.are still ran
D.is still run