以下哪项是铜的特点 A.
电阻大 B.
密度小 C.
耐氧化性好 D.
导电性弱

单项选择题Which one is wrong about Equal-width (distance) partitioning and Equal-depth (frequency) partitioning? A、Equal-width partitioning is the most straightforward, but outliers may dominate presentation. B、Equal-depth partitioning divides the range into N intervals, each containing approximately same number of samples. C、The interval of the former one is not equal. D、The number of tuples is the same when using the latter one.

单项选择题已知的世界上最坚硬的天然物质是什么？