以老师的身份讲解题目，生成视频---Question Stem: 用如图所示的实验装置“探究弹簧弹力与形变量的关系”。现将弹簧竖直悬挂, 自然下垂, 此时弹簧下端记为测量起点, 挂一个钩码后弹簧下端下移的距离为 $x$; 若再挂上一个相同的钩码, 弹簧下端再次下移的距离. Options: A. 大于 $x$ B. 等于 $x$ C. 小于 $x$ D. 等于 $2x$ Chart/Diagram Description: Type: Experimental setup diagram. Main Elements: - A vertical support stand with a rectangular base. - A horizontal rod is attached to the top of the vertical stand via a clamp. - A coiled spring is suspended vertically from the horizontal rod. - A vertical ruler or scale with markings is attached to the horizontal rod, positioned alongside the spring. The scale markings appear to be in millimeters or similar units. - A hook weight (appearing as two connected rectangular blocks with a hook at the bottom) is hanging from the lower end of the spring. - The diagram shows the spring with a hook weight attached, and the scale next to it, suggesting a measurement is being taken. Although the question describes adding weights sequentially, the diagram primarily illustrates the setup for measuring the spring's extension. It shows the spring with one hook weight. Other Relevant Text: 1. (2025 · 江苏盐城市合格考模拟)