请提供这道题的解题思路和步骤---**Question Stem:** 天平两侧烧杯相同、水深相同, 球体体积相同, 天平向哪侧倾斜 ( ) **Options:** A. 向右 B. 向左 C. 平衡 D. 不确定 **Chart/Diagram Description:** * **Type:** Diagram illustrating a balance scale setup. * **Main Elements:** * A simple balance beam resting on a triangular fulcrum. * Two identical beakers containing liquid (implied water) are placed on the pans of the balance. * The water level in both beakers is the same. * On the left side, a sphere labeled "乒乓球" (Ping pong ball) is shown floating in the beaker. It is partially submerged. * On the right side, a sphere labeled "铁球" (Iron ball) is shown fully submerged in the beaker. The iron ball is suspended from a stand above the beaker by a string, indicating it is not resting on the bottom and is supported by the stand. * The volume of the ping pong ball and the iron ball is the same (stated in the question).