{"version":"1.0","type":"rich","provider_name":"Calcton","provider_url":"https://www.calcton.com","title":"组距计算器 - 频数分布分组宽度与组数","author_name":"Calcton","author_url":"https://www.calcton.com","width":600,"height":560,"html":"<iframe src=\"https://www.calcton.com/embed/class-width\" width=\"600\" height=\"560\" style=\"border:none;max-width:100%;\" loading=\"lazy\" allow=\"clipboard-write\" title=\"组距计算器 - 频数分布分组宽度与组数 - Calcton\"></iframe>","cache_age":86400}