某幢楼的楼梯每一级台阶的高度为20厘米宽度30cm求斜面ab的坡度
2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58 2025-02-03 02:01:58