以资深数学教师的身份解析本题答案，不允许出错，图文并茂，用不同的颜色标注，语言风趣幽默，深入浅出。---**Question Stem:** 如图1, 在Rt△ABC中, CD 是斜边AB 上的高, ∠A≠45°, 则下列比值中不等于sin A的是 **Options:** A. $\frac{CD}{AC}$ B. $\frac{BD}{CB}$ C. $\frac{CB}{AB}$ D. $\frac{CD}{CB}$ **Diagram Description:** * **Type:** Geometric figure, a right-angled triangle with an altitude drawn from the right angle to the hypotenuse. * **Elements:** * A right triangle ABC, where ∠C is the right angle (90 degrees). * Point D is on the hypotenuse AB. * CD is a segment from C to D, perpendicular to AB, meaning CD is the altitude from C to AB. There is a right angle symbol at D, indicating that ∠CDA and ∠CDB are 90 degrees. * The vertices are labeled A, B, and C. Point D is labeled on the hypotenuse AB. * The angle ∠A is marked as not equal to 45 degrees.