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Drama is a film and television aggregation and sharing platform built by users, committed to creating an open, free and diversified film and television resource community. Here, users can freely upload and share movie resources, enjoy good movies and discover unpopular masterpieces with tens of millions of drama fans. We insist on rapid content updates and continuous optimization of the platform, and strive to provide the most convenient service experience for moviegoers and sharers. In the drama network, every "encounter" is an unexpected encounter brought by a good drama.

在线通过压力，钢球直径以及压痕直径来计算布氏硬度