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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) = 54 *π and r^2 = 9, so the radius of the cylinder is 3. The circumference of a circle with radius r is equal to 2 *π r; therefore, the circumference of the base is equal to 6 *π.
