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答案：B
解析：
Every cube has 6 identical square faces. Since the total surface area of this cube is 54(x^2), each face has area (54(x^2)) over 6 equals 9(x^2). Therefore, each edge has length square root (9(x^2)), or 3x. The volume is (3x)^3, or 27(x^3).
adj. 相同的，同一的
