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答案：C
解析：
The volume of a cylinder with radius r and height h is equal to π*(r^2)*h. Therefore, π*(r^2)*(6) = 54π and r^2 = 9, so the radius of the cylinder is 3. The circumference of a circle with radius r is equal to 2π*r; therefore, the circumference of the base is equal to 6π.
